Revert "Add gsutil 4.13 to telemetry/third_party"

tools/telemetry/third_party/gsutil/CHANGES.md

Index: tools/telemetry/third_party/gsutil/CHANGES.md
diff --git a/tools/telemetry/third_party/gsutil/CHANGES.md b/tools/telemetry/third_party/gsutil/CHANGES.md
deleted file mode 100644
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@@ -1,1584 +0,0 @@
-Release 4.13 (release date: 2015-06-03)
-=======================================
-New Features
-------------
-- Added -U flag to cp and rsync commands to allow skipping of unsupported
-  object types.
-- Added support for Google Developer Shell credentials.
-
-Bug Fixes
----------
-- Precondition headers (x-goog-if-...) are now respected for the setmeta
-  command.
-- Fixed an index out of range error that could occur with an empty
-  parallel composite upload tracker file.
-- The stat command outputs errors to stderr instead of stdout.
-- Fixed two possible sources of ResumableUploadStartOverException from
-  httplib2 and oauth2client.
-- Fixed a bug in the compose command where a missing source object resulted
-  in an error message claiming the destination object was missing.
-
-Other Changes
--------------
-- Added a help section on throttling gsutil.
-- Resumable uploads will now start over if a PUT to the upload ID returns
-  an HTTP 404. Previously this behavior applied only to an HTTP 410.
-- XML API resumable uploads now retry on HTTP 429 errors, matching the
-  behavior of JSON API resumable uploads.
-- Improved response to process kill signals, reducing the likelihood of
-  leaving orphaned child processes and temporary files.
-- Bucket lifecycle configuration now works for S3.
-- Removed the deprecated setmeta -n option.
-
-
-Release 4.12 (release date: 2015-04-20)
-=======================================
-New Features
-------------
-- Added support for JSON-format service account private key files.
-- Added support for the Rewrite API (JSON API only). This is used for
-  all copies within the Google Cloud and supports copying objects across
-  storage classes and/or locations.
-
-Bug Fixes
----------
-- Fixed a bug that could cause downloads to have a hash mismatch (and deletion
-  of the corrupted file) when resumed across process breaks via a tracker file.
-
-Other Changes
--------------
-- Updated documentation and examples for several topics including
-  acl, cp, dev, signurl, stat, and wildcards.
-
-
-Release 4.11 (release date: 2015-03-10)
-=======================================
-New Features
-------------
-- Added Nearline storage class support to the mb command.
-
-Bug Fixes
----------
-- Fixed a bug for streaming uploads that could occasionally cause a HTTP 410
-  from the service or a hash mismatch (and deletion of the corrutped file).
-- Fixed an OverflowError that occurred when uploading files > 4GiB on a 32-bit
-  operating system.
-
-Other Changes
--------------
-- Added documentation around using the Content-MD5 header to extend integrity
-  checking to include checksums computed by a client-side content pipeline.
-
-
-Release 4.10 (release date: 2015-03-03)
-=======================================
-Bug Fixes
----------
-- Fixed a bug that could cause undetected data corruption (preserving incorrect
-  data) if a streaming upload encountered a service error on non-8KiB-aligned
-  boundary.
-- Fixed a bug that caused downloads to be truncated if the connection broke,
-  resulting in a hash mismatch (and deletion of the corrupted file) for that
-  download.
-- Fixed a format string arguments error that occurred if a download exhausted
-  all retries.
-
-Other Changes
--------------
-- The lifecycle command now accepts JSON input in the form of
-  "{ "lifecycle": { "rule" ..." in addition to "{ "rule": ...".
-- Improved access token expiry logic for GCE credentials.
-
-
-Release 4.9 (release date: 2015-02-13)
-=======================================
-New Features
-------------
-- When using the JSON API, the ch acl/defacl subcommand now supports
-  project groups via the -p flag. For details, see "gsutil help acl ch".
-
-Bug Fixes
----------
-- Fixed a bug that caused daisy-chain copies (including cross-provider
-  copies) for files large than 100MiB to fail.
-- Fixed a bug that caused streaming uploads than ran for longer than
-  an hour to fail with HTTP 400s.
-- Fixed a bug where perfdiag would not properly clean up its test files.
-- Fixed a bug where using ls with the XML API could mistakenly report bucket
-  configuration as present.
-
-Other Changes
--------------
-- Updated documentation for metadata, retries, security, and subdirs.
-- Tracker files are no longer written for small downloads.
-
-
-Release 4.8 (release date: 2015-01-23)
-=======================================
-New Features
-------------
-- gsutil now supports HTTP proxy configuration via the http_proxy,
-  https_proxy, or HTTPS_PROXY environment variables. This configuration
-  is used only if proxy configuration is not present in the .boto
-  configuration file.
-- gsutil rsync now supports regex-based source and destination URL
-  exclusion via the -x flag.
-- The rm command now supports arguments on stdin via the -I flag.
-
-Bug Fixes
----------
-- Fixed a bug where perfdiag would fail if netstat was not available.
-- Fixed a bug where temporary ca_certs files were not being cleaned up.
-- Fixed a bug in rsync to unnecessarily remove or write objects, in some
-  cases leaving the destination in a non-synchronized state.
-  caused rsync to unnecessarily remove or rewrite objects.
-- Fixed a bug where rsync temporary listing files were not being
-  cleaned up when the rsync process was killed.
-- Fixed a bug where rsync would remove destination URLs if listing the
-  source encountered a non-retryable failure (for example, if the source
-  did not exist).
-- Fixed a bug where mv would fail for some Unicode filenames.
-- Fixed a bug where mv would remove the source URL after skipping the
-  destination URL.
-- Fixed a bug that caused daisy chain uploads to hang if the download thread
-  raised an exception.
-- Fixed a bug where acl ch would return a zero exit code even if it failed.
-- Fixed a bug that sometimes caused the progress display to render multiple
-  times at the end of an upload or download.
-
-Other Changes
--------------
-- Resumable uploads of files using the JSON API now send their data in a
-  single request, making separate HTTP calls only when resuming is necessary.
-- The test command now runs tests in parallel by default, and test
-  parallelism on Windows is now supported.
-- All non-streaming downloads are now resumable (and retryable) by default,
-  regardless of size.
-- Canned ACLs and canned default object ACLs are now supported in the JSON
-  API (previously they would fall back to using the XML API).
-- Google Compute Engine service account credential tokens are now cached,
-  avoiding unnecessary refreshes.
-- Improved detection of the Google Compute Engine metadata server,
-  particularly when using the -m flag for multiprocessing.
-- Added new help sections about filename encoding and security/privacy
-  considerations.
-- Download progress is now displayed for small XML API downloads.
-
-
-Release 4.7 (release date: 2014-11-17)
-=======================================
-New Features
-------------
-- Tab completion now works on gs:// URLs (for Cloud SDK installs only).
-  To install via Cloud SDK, see https://cloud.google.com/sdk/#Quick_Start
-- Streaming uploads (with source URL "-") using the JSON API now buffer
-  in-memory up to 100MB, allowing large streams to be retried in the event
-  of network flakiness or service errors.
-- Resumable uploads that receive a fatal service error (typically a 410)
-  are now automatically retried from the beginning.
-
-Bug Fixes
----------
-- Fixed an apitools bug that impacted upload performance and caused
-  "Retrying from byte __ after exception" to print after every 100MiB.
-- Fixed _$folder$ placeholder object detection on versioned buckets.
-- Removed an unnecessary credential check on load which increased
-  startup time by over one second in some cases.
-- SignURL now properly retries when checking if the signed object is
-  readable.
-- Files with both Content-Encoding and Content-Type gzip are now properly
-  removed when hash validation fails (only one of the two should be set).
-- The x-goog-if-generation-match:0 header now works properly with the XML API.
-- Fixed a bug that caused "defacl ch" on a bucket with a private ACL to fail.
-- The rm command now properly supports precondition headers.
-- Fixed a bug that caused large streaming uploads to fail with the message
-  "Failure: length too large" when using the JSON API.
-- Fixed a bug that caused JSON lifecycle configurations with createdBefore
-  conditions to fail with a DecodeError.
-
-Other Changes
--------------
-- Byte counts now display accurate abbreviations of binary sizing. For example,
-  messages previously labeled MB are now properly labeled MiB to indicate
-  2**20 bytes. Only the labeling changed - the actual sizes were always binary.
-- Improved Cloud SDK integration, including improved error messages
-  and instructions.
-- The num_retries .boto configuration value now applies to all requests
-  (previously it was ignored for JSON API requests).
-- rsync now works with non-existent destination subdirectories.
-- Raised the default resumable upload threshold from 2MB to 8MB to
-  improve performance.
-- Benign retry messages now print only when debug mode is enabled via the
-  top-level -d flag.
-- The top-level -q flag now suppresses suggestions to use the -m flag.
-- Command synopsis is now output when the wrong number of arguments are
-  provided.
-- Removed dependency on google-api-python-client module, added dependencies on
-  oauth2client and six modules.
-
-Release 4.6 (release date: 2014-09-08)
-=======================================
-
-Bug Fixes
----------
-- Fixed a TypeError bug that occurred in perfdiag write throughput tests.
-- Fixed an rsync bug that caused invalid symlinks to abort the transfer
-  even when -e option was specified.
-- Fixed a perfdiag assumption that ipaddrlist was populated.
-- Fixed an AttributeError when setting an invalid canned ACL with defacl set.
-- Fixed a bug where non-resumable uploads would include payload in debug output
-  when for running in debug mode (-D).
-
-Other Changes
--------------
-- Added the proxy_rdns configuration variable for clients that
-  do DNS lookups via a proxy.
-- Added the state_dir configuration variable for choosing the location of
-  gsutil's internal state files, including resumable transfer tracker files.
-  resumable_tracker_dir configuration variable is now deprecated.
-- Added DNS, connection latency, and proxy use information to perfdiag
-  command.
-- perfdiag command will not perform DNS lookups if they are disabled in
-  boto config.
-- perfdiag command will now only attempt to delete uploaded objects when
-  running write tests.
-- Added code coverage support to test command.
-- rsync -d now succeeds on a 404 for a to-be-deleted object (for example, when
-  the object was already deleted by an external process).
-
-Release 4.5 (release date: 2014-08-14)
-=======================================
-
-Bug Fixes
----------
-- Fixed a bug that caused resumable uploads to restart if gsutil was
-  terminated with CTRL-C.
-- Fixed a bug in defacl ch command that caused a failure when updating
-  an existing default object ACL entry.
-- Fixed an invalid literal bug during rsync file listing.
-- Made several improvements to JSON upload stability, including fixing a bug
-  which occasionally caused resumable upload hashes not to catch up properly.
-- All JSON calls now have socket timeouts, eliminating hangs under
-  flaky network conditions.
-- Fixed a bug where acl ch -g AllAuthenticatedUsers would instead add
-  AllUsers.
-- Fixed a bug that caused object custom metadata not to be preserved when
-  copying in the cloud.
-- Fixed a bug where du -s did not properly elide subdirectories.
-
-Other Changes
--------------
-- Parallel composite uploads are now disabled by default until crcmod is
-  available in major Linux distributions. To re-enable the setting from
-  prior versions, in the [GSUtil] section of your .boto config file, add:
-  parallel_composite_upload_threshold=150M
-- Non-wildcarded URLs for existing objects now use Get before trying List
-  (as in gsutil3), and thus are not subject to eventual listing consistency.
-- gsutil -D now redacts proxy configuration values in the output.
-
-Release 4.4 (release date: 2014-07-17)
-=======================================
-
-New Features
-------------
-- Added the hash command, which can calculate hashes of local files.
-  gsutil already calculates hashes for integrity checking, but this allows
-  the user to separately calculate the MD5 and CRC32c hashes of a local file.
-
-Bug Fixes
----------
-- Many improvements to JSON API media transfers, including far
-  more robust retry logic.
-- Fixed "File changed during upload: EOF..." errors on XML resumable uploads.
-- Fixed rsync command to read and write index files in binary mode.
-- Fix potential TypeError in _CheckAndHandleCredentialException.
-- Fixed possible data corruption when using JSON API uploads for
-  small files with lines starting with "From:", which would cause
-  integrity checks to fail.
-- Fixed gsutil cp to skip directory placeholders when downloading, avoiding
-  "directory exists where the file needs to be created" errors.
-- Fixed daisy chain cp/rsync for files >= 100MB.
-- Fixed a bug in JSON proxy support where the proxy info was sometimes unused.
-- Fixed a bug where an acl get on a private default object ACL returned an
-  error instead of a blank ACL.
-- Fixed a JSON API issue with large HTTP responses on 32-bit systems.
-
-Other Changes
--------------
-- Improved object listing performance when using the XML API.
-- Improved various error messages.
-- Improved progress display during media transfer.
-- Switched to truncated exponential backoff for retries.
-- Improved OS-specific ulimit checks.
-- Added some information such as OS and Cloud SDK wrapping to gsutil version,
-  and changed the output format to be more uniform.
-- Daisy chain cp/rsync now supports resumable uploads.
-- Improved proxy support for proxy username and passwords.
-- x-amz headers are now supported for cp, rsync, and setmeta.  x-amz-meta
-  headers continue to be supported as well.
-
-Release 4.3 (release date: 2014-06-10)
-=======================================
-
-Bug Fixes
----------
-- Fix acl/defacl ch changing the role of an existing group.
-- Fix unicode and 404 errors when using manifests.
-- Fix parallelism configuration bug that limited gsutil rsync to two threads
-  and could lead to rsync hangs. "gsutil -m rsync" runs much faster, and rsync
-  uploads of large local files are now faster via parallel composite upload.
-  Parallel composite uploads of large files are also faster.
-- Fix rsync bug with parallel composite uploads.
-- Fix TypeError that could occur when running the cp command with no
-  credentials.
-
-Other Changes
--------------
-- Progress indicators for -m cp/rsync commands are now more readable.
-- Added command being run to gsutil -d/-D output.
-- Lowered default parallelism for 'gsutil -m test' and added hang detection.
-
-Release 4.2 (release date: 2014-06-05)
-=======================================
-
-New Features
-------------
-- Added parallel test execution support to test command, ex: "gsutil -m test"
-
-Bug Fixes
----------
-- Fix failure during retry of an XML download.
-- Moved to boto release 2.29.1 fixing boto authentication erroneously
-  reporting OAuth2 credentials as invalid.
-- Fix parallel composite uploads when using only a single process and thread.
-- Fix an invalid seek during daisy chain operation that affected file copy
-  from Google Cloud Storage -> S3 for files greater than 8KB in size.
-- Fix "gsutil acl ch" with AllUsers or AllAuthenticatedUsers groups.
-- Fix some copy errors writing new lines to the manifest file.
-- Fix "gsutil test" return code to properly be 0 on success.
-
-Other Changes
--------------
-- "gsutil cp -z" now ignores whitespace in the extension list.
-
-Release 4.1 (release date: 2014-05-28)
-=======================================
-
-Bug Fixes
----------
-- Fixed a bug in parallel composite uploads where uploads with
-  existing components would fail.
-- Moved gcs-oauth2-boto-plugin to version 1.5, fixing a bug in the PyPi gsutil
-  distribution that would cause gsutil to unnecessarily attempt to query
-  the Google Compute Engine metadata service.
-
-Other Changes
--------------
-- Parallel composite uploads no longer specify an if-not-match precondition
-  when uploading component parts.
-- Parallel composite uploads no longer calculate a CRC32c hash prior to
-  uploading component parts (these are still validated by an MD5 hash).
-- Removed apitools dependency on gflags.
-
-Release 4.0 (release date: 2014-05-27)
-=======================================
-
-Major New Gsutil Version - Backwards-Incompatible Changes
-------------------------------
-- The Google Cloud Storage configuration data supported by the acl, cors,
-  and lifecycle commands now uses the JSON format instead of the older XML
-  format. gsutil 4.0 will fail and provide conversion instructions if an XML
-  configuration file is provided as an argument for a gs:// URL.
-- gsutil no longer accepts arbitrary headers via the global -h flag.
-  Documented headers for gsutil commands are still supported; for the
-  full list of supported headers, see "gsutil help command_opts".
-- The compose command will now default the destination object's
-  Content-Type to the Content-Type of the first source object if none
-  is provided via the -h global flag.
-- The long-deprecated -t and -q options have been removed from the cp command.
-- The perfdiag command no longer supports adding a host header.
-- Having OAuth2 User Account credentials and OAuth2 Service Account
-  credentials configured simultaneously will now fail with an error message
-  to avoid confusion.  Also, a single invalid credential will fail with an
-  error message.  See "gsutil help creds" for details.
-- Bucket relocate scripts have been removed.
-- Downloading object names ending with '/' is no longer supported to avoid
-  problems this caused for directores using the Google Cloud Console.
-- rm -r now implies rm -ra (removing all object versions recursively).
-- All commands using the global -m option or a force option (such as 
-  rm -f or cp -c) will now return a non-zero exit code if there are any
-  failures during the operation.
-- MD5 and CRC32c values are now represented in base64 encoding instead
-  of hex encoding (this includes manifest files).
-
-New Features
-------------
-- The Google Cloud Storage JSON API (v1) is now the default API used
-  by gsutil for all commands targeting gs:// URLs. The JSON API is more
-  bandwidth efficient than the older XML API when transferring metadata
-  and does not require separate calls to preserve object ACLs when copying.
-  The XML API will automatically be used when accessing s3:// URLs.
-- The Google Cloud Storage XML API can be used in lieu of the JSON API
-  by setting 'prefer_api = xml' in the GSUtil section of your boto config file.
-- Added the rsync command that can synchronize cloud and local directories.
-- Added the signurl command that can generate Google Cloud Storage signed URLs.
-- The perfdiag command now supports a listing latency test.
-- The rb command now supports a -f flag allowing it to continue when errors
-  are encountered.
-- The test command now supports a -s flag that runs tests against S3.
-
-Other Changes
--------------
-- All python files not under a third_party directory are now pylint-clean,
-  with the exception of TODO-format and a handful of warnings in root-level
-  files. As part of the de-linting process, many edge-case bugs were
-  identified and fixed.
-- The ls command now operates depth-first (as in Unix ls) instead
-  of breadth-first.
-- Daisy-chain copying does not currently support resumable uploads.
-- Several compatibility improvements for Windows and S3.
-
-
-Release 3.42 (release-date: 2014-01-15)
-=======================================
-
-Other Changes
--------------
-
-- Fixed potential bug with update command on CentOS.
-
-
-Release 3.41 (release-date: 2014-01-14)
-=======================================
-
-Other Changes
--------------
-
-- Changes to protect security of resumable upload IDs.
-
-
-Release 3.40: Skipped
-
-
-Release 3.39: Skipped
-
-
-Release 3.38 (release-date: 2013-11-25)
-
-Bug Fixes
----------
-
-- Fix to include version number in user-agent string.
-- Fix bug wherein -m flag or parallel uploads caused crash on systems without
-  /dev/shm.
-- Fix SSL errors and invalid results with perfdiag -c and -k rthru test.
-- Fixed cases where parallel composite uploads could leave orphaned components.
-- Fix bug attempting to stat objects you don't have auth to read.
-- Fixed bug breaking defacl's -d option.
-
-
-Other Changes
--------------
-
-- Fixed gsutil config doc.
-- Fixed references to old command names; fix defacl ch example.
-- Improved error messages for deprecated command aliases.
-- Updated gsutil support info.
-
-
-New Features
-------------
-
-- Enabled -R flag for recursion with setmeta command.
-
-
-Release 3.37 (release-date: 2013-09-25)
-=======================================
-
-Bug Fixes
----------
-
-- Fix parsing of -R for "acl ch" and chacl commands.
-- Fixed import statement of unittest2 which caused installations using Python
-  2.6 without unittest2 installed to fail when starting up gsutil.
-
-
-Other Changes
--------------
-
-- Fixed tests so they pass on Windows and package installs.
-- Add a root logging handler manually instead of relying on basicConfig.
-- Fix apiclient import statement.
-- Exponential backoff for access token requests.
-- Fix flakiness in test TearDown to account for eventual consistency of object
-  listings.
-
-
-Release 3.36 (release-date: 2013-09-18)
-=======================================
-
-Bug Fixes
----------
-
-- Fix bug when a 400 or 403 exception has no detail.
-- Fix bugs with config -e and config -o.
-
-
-Other Changes
--------------
-
-- Clarify stat command documentation regarding trailing slashes.
-- Add Generation and Metageneration to gsutil stat output.
-
-
-New Features
-------------
-
-- Set config values from command line with -o.
-
-
-Release 3.35 (release-date: 2013-09-09)
-=======================================
-
-Bug Fixes
----------
-
-- Fix streaming upload to S3 and provide more useful stack traces multi-threaded failures.
-- Fix race condition in test_rm.
-- Fix retry decorator during test bucket cleanup.
-- Fixed cat bug that caused version to be ignored in URIs.
-- Don't decode -p or -h values other than x-goog-meta-. Fixes ability to use string project names.
-- Update bucket_relocate.sh to work on GCE.
-- Fix recursive uploading from subdirectories with unexpanded wildcard as source URI.
-- Make gsutil error text include <Message> content.
-- Change shebang line back to python because this doesn't work on some systems.
-- Fix hash_algs differences in perfdiag.
-- Update Python version check and shebang line.
-- Enforce project_id entry in config command; provide friendly error if missing proj ID.
-- Use transcoding-invariant headers when available in gs.Key.
-- Make gsutil cp not fail if unable to check versioning config on dest bucket.
-- Make gsutil detect when config fails because of proxy and prompt for proxy config.
-- Avoid checking metageneration attribute when long-listing S3 objects.
-- Exclude the no-op auth handler as indicating credentials are configured.
-
-
-New Features
-------------
-
-- Implemented gsutil stat command.
-
-
-Other Changes
--------------
-
-- Consolidate config-related commands.
-- Changed rm -r gs://bucket to delete bucket at end.
-- Various doc cleanup and improvement.
-- Warn user before updating to major new version. Also fixed minor version comparison bug, and added tests.
-- Change max component count to 1024.
-- Add retry-decorator as a submodule.
-- Explicitly state control chars to avoid in gsutil naming documentation.
-- Make config command recommend project strings.
-- Made long listing format a little better looking.
-- Allow --help flag for subcommands.
-- Implement help for subcommands and add OPTIONS sections for subcommands.
-- Add more detailed error message to notification watchbucket command.
-- Add notification URL configuration for notification tests.
-- Refactor to use upstream retry_decorator as external dependency.
-- Distribute cacerts file with gsutil.
-- Updated gsutil help to point to Google Cloud Console instead of older APIs console.
-- Make gsutil pass bundled cacerts.txt to oauth2client; stop checking SHA1 of certs, now that we no longer depend on boto distribution.
-- Move all TTY checks to a common util function and mock it for update tests.
-- Fix duplicate entry created in .gitmodules.
-- Fix unit test breakage because VERSION file is old.
-- Fix test using ? glob with ObjectToURI.
-- Fix update tests that fail for package installs.
-- Change bucket delete teardown to try more times.
-- Fix tests that perform operations on bucket listings.
-- Keep package install set to True unless VERSION file doesn't exist.
-- Fix handling of non-numeric version strings in update test.
-
-
-Release 3.34 (release-date: 2013-07-18)
-=======================================
-
-Bug Fixes
----------
-
-- Fixed a bug where the no-op authentication handler was being loaded after
-  other authentication plugins, causing the no-op handler to be chosen instead
-  of other valid credentials.
-
-
-Release 3.33 (release-date: 2013-07-16)
-=======================================
-
-Bug Fixes
----------
-
-- Added .git* to MANIFEST.in excludes and fixed cp doc typo. This was needed to
-  overcome problem caused by accidental inclusion of .git* files in release,
-  which caused the update command no longer to allow updates (since starting
-  in 3.32 it checks whether the user has any extraneous files in the gsutil
-  directory before updating)
-
-
-Release 3.32 (release-date: 2013-07-16)
-=======================================
-
-New Features
-------------
-
-- Added support for getting and setting lifecycle configuration for buckets.
-- Implemented Parallel Composite Uploads.
-- Added a new du command that displays object size, similar to Linux du.
-
-
-Bug Fixes
----------
-
-- Fixed a bug when using ls -R on objects with trailing slashes. Closes #93.
-- Fixed so won't crash in perfdiag when nslookup is missing or gethostbyname
-  fails.
-- Smartly compare version strings during autoupdate check.
-- Made header handling for upload case-insensitive.
-- Re-enabled software update check for users with no credentials configured.
-- Fixed incorrectly-generated password editing comment in service account
-  config. Fixes #146.
-
-
-Other Changes
--------------
-
-- Improved flow when encounter auth failure for GCE service account with no
-  configured storage scopes:
-    1. Changed HasConfiguredCredentials() logic not to include
-       has_auth_plugins as part of the evaluated expression, since that will
-       always evaluate to true under GCE (since GCE configures its internal
-       service account plugin under /etc/boto.cfg).
-    2. Changed ConfigureNoOpAuthIfNeeded logic so we configure no-op auth
-       plugin even if there is a config_file list, since GCE always configures
-       /etc/boto.cfg, even if user has no storage scopes configured.
-    3. Additional changes:
-      a. Removed assertion of oauth access token cache check log from
-         test_Doption.py, which may not be true sometimes (e.g., if user is
-         using HMAC creds).
-      b. Removed remnants of CONFIG_REQUIRED left over from earlier CL.
-      c. Merged dupe _ConfigureNoOpAuthIfNeeded functions from two code files,
-         moved to util.py.
-- Fixed confusing gsutil rm "Omitting" message.
-- Wrapped long gsutil update message.
-- Silenced additional possible perfdiag errors.
-- Improved perfdiag performance by only generating one chunk of random file.
-- Changed to swallow broken pipe errors when piping gsutil to other programs.
-- Made DotfulBucketNameNotUnderTld error message more user friendly.
-- Extracted function for building ACL error text from main try/except loop,
-  for better readability.
-- Disallowed gsutil update when user data present in gsutil dir.
-- Plumbed accept-encoding into HEAD requests in ls -L command.
-- Updated README and moved ReleaseNotes.txt to CHANGES.md.
-- Updated crcmod docs with link to Windows installer.
-- Updated documentation regarding gzip content-encoding.
-- Removed StorageUri parse check for lone ':' (interferes with using filenames
-  containing ':')
-- Added tests for gsutil update check and fixed bug for bad file contents.
-- Set accept-encoding and handle gzip on-the-fly encoding.
-
-
-Release 3.31 (release-date: 2013-06-10)
-=======================================
-
-New Features
-------------
-
-- Implemented consumption of manifest files for cp.
-- Add ETag to ls -l and make ls -b variants more efficient.
-- Expand the manifest path to allow for tildes in paths.
-- Added bucket_relocate.sh script to gsutil.
-
-
-Bug Fixes
----------
-
-- Fix gsutil cp -R to copy all versioned objects.
-- Fixed bug where gsutil cp -D -n caused precondition failure.
-- Fixed gsutil daisy-chain copy to allow preserving ACLs when copying within
-  same provider.
-- Fix identification of non-MD5 ETags.
-- Fixed bugs where gsutil -q cp and gsutil cp -q sometimes weren't quiet.
-- Fixed unicode error when constructing tracker filename from non-ASCII
-  Unicode filename.
-- Fixed that noclobber would not resume partial resumable downloads.
-- Fixed bug when running gsutil cp -Dp by user other than object owner.
-- Properly encode metageneration and etag in ls output with -a and -e.
-- Update resumable threshold stated in gsutil help prod.
-
-
-Other Changes
--------------
-
-- ls -Lb no longer shows total # files/total size of bucket, so that ls -Lb
-  instead provides an efficient way to view just the metadata for large buckets.
-- Catch and ignore EEXIST error when creating gsutil tracker dir.
-- Add note to gsutil update doc about auto-update checks being disabled with
-  gsutil -q option.
-- Disable hashing and increase buffer size in perfdiag.
-- Added better error messages for service account auth.
-- Make perfdiag behave more like normal gsutil, with multi-threading option.
-- Changed so auto-update check/prompt aren't made if gsutil -q specified.
-- Changed gsutil mb command to clarify that EU means European Union.
-- Added doc warnings about losing version ordering if using gsutil -m cp
-  between versioned buckets; removed trailing whitespace.
-- Added to gsutil cp -L doc to describe how to build a reliable script for
-  copying many objects.
-
-
-Release 3.30 (release-date: 2013-06-10)
-=======================================
-
-- Abandoned.
-
-
-Release 3.29 (release-date: 2013-05-13)
-=======================================
-
-Bug Fixes
----------
-
-- Fixed incorrect package installation detection that resulted in not being
-  able to run the update command while running gsutil from a symlink.
-
-Other Changes
--------------
-
-- Added a test for debug mode (gsutil -D) output.
-- List numbering and title case fixes in additional help pages.
-- Removed dateutil module dependency from cp command test.
-- Updated documentation to clarify that public-read objects are cached for 1
-  hour by default.
-- Added a filter to suppress "module was already imported" warnings that were
-  sometimes printed while running gsutil on Google Compute Engine instances.
-
-
-Release 3.28 (release-date: 2013-05-07)
-=======================================
-
-New Features
-------------
-
-- Added support for new Object Change Notifications feature.
-
-Bug Fixes
----------
-
-- Fixed problem where gsutil update command didn’t take default action.
-- Fixed a problem with the update command sometimes triggering an additional
-  update command.
-
-Other Changes
--------------
-
-- Add packaging information to version output.
-- Removed fancy_urllib, since it is no longer used.
-- Changed num_retries default for resumable downloads to 6.
-- Don’t check for newer software version if gs_host is specified in boto
-  config file.
-- Modified oauth2client logging behavior to be consistent with gsutil.
-- Added gs_port configuration option.
-- Skip update tests when SSL is disabled.
-
-
-Release 3.27 (release-date: 2013-04-25)
-=======================================
-
-New Features
-------------
-
-- Added a human readable option (-h) to ls command.
-- Changed WildcardIterator not to materialize list of all matching files from
-  directory listing (so works faster when walking over large directories)
-- Added -f option to setacl command to allow command to continue after errors
-  encountered.
-- Add manifest log support for the cp command.
-- Added never option for check_hashes_config; fixed bug that assumes an ETag
-  is always returned from server.
-- Made gsutil provide friendlier error message if attempting non-public data
-  access with missing credentials.
-- Set 70 second default socket timeout for httplib.
-- Add ability to run a single test class or function with the test command.
-
-Bug Fixes
----------
-
-- Don't check for updates if the user has no credentials configured. This
-  fixes a bug for users without credentials trying to use gsutil for first
-  time.
-- Fixed case where chacl command incorrectly recognized an email address as a
-  domain.
-- Fix setmeta command for S3 objects.
-- Fixed bug where wildcarded dest URI attempted string op on Key object.
-- Fixed case where gsutil -q outputted progress output when doing a streaming
-  upload.
-- Error handling for out of space during downloads.
-- Include ISO 8601-required "Z" at end of timestamp string for gsutil ls -l,
-  to be spec-compliant.
-- Removed deprecated setmeta syntax and fixed unicode issues.
-- Changed update command not to suggest running sudo if running under Cygwin.
-- Removed references to deprecated gs-discussion forum from gsutil built-in
-  help.
-- Add literal quotes around CORS config example URL in gsutil setcors help to
-  avoid having example URL turn into an HREF in auto-generated doc.
-
-Other Changes
--------------
-
-- Added proper setup.py to make gsutil installable via PyPi.
-- Added warning to gsutil built-in help that delete operations cannot be
-  undone.
-- Replaced gsutil's OAuth2 client implementation with oauth2client.
-- Updates to perfdiag.
-- Updated config help about currently supported settings.
-- Fixes to setup.py and modified version command.
-- Move gslib/commands/cred_types.py to gslib, so only Command subclasses live
-  in gslib/commands.
-- Updated gsutil setmeta help no longer to warn that setmeta with versioning
-  enabled creates a new object.
-
-
-Release 3.26 (release-date: 2013-03-25)
-=======================================
-
-New Features
-------------
-
-- Added support for object composition.
-- Added support for external service accounts.
-- Changed gsutil to check for available updates periodically (only while
-  stdin, stderr, stdout are connected to a TTY, so as not to interfere with
-  cron jobs).
-- Added chdefacl command.
-- Made gsutil built-in help available under
-  https://developers.google.com/storage/docs/gsutil
-- Add a command suggestion when the command name is not found.
-- Added byte suffix parsing to the -s parameter of perfdiag.
-- Added --help support to subcommands. Fixes #96.
-- Updated perfdiag command to track availability and record TCP settings.
-- Added metadata parameter to perfdiag command.
-- Added support for specifying byte range to cat command.
-- Output more bucket metadata on ls -Lb.
-- Implemented gsutil -q (global quiet) option (fixes issue #130). Also changed
-  gsutil to output all progress indicators using logging levels. Also changed
-  help command not to output bold escape sequences and not use PAGER if stdout
-  is not a tty, which also fixes bug that caused gsutil help test to fail.
-- Plumbed https_validate_certificates through to OAuth2 plugin handler,
-  allowing control over cert validation for OAuth2 requests
-- Fixed ISO 639.1 ref in config command help text
-
-Bug Fixes
----------
-
-- Fixed bug where gsutil cp -D didn't preserve metadata
-- Fixed problem where gsutil -m is hard to interrupt (partial fix for issue
-  #99 - only for Linux/MacOS; problem still exists for Windows).
-- Fixed broken reference to boto_lib_dir in update command.
-- Made changing ACL not retry on 400 error.
-- Fixed name expansion bug for case where uri_strs is itself an iterator
-  (issue #131); implemented additional naming unit test for this case.
-- Fixed flaky gsutil rm test
-- Fixed a bug in the chacl command that made it so you couldn't delete the
-  AllAuthenticatedUsers group from an ACL.
-
-Other Changes
--------------
-
-- Refactored gsutil main function into gslib, with gsutil being a thin
-  wrapper.
-- Added a test for the update command.
-- Renamed gsutil meta_generation params to metageneration, for consistency
-  with GCS docs.
-- Removed .pyc files from tarball/zipfile.
-- Added new root certs to cacerts.txt, to provide additional flexibility
-  in the future.
-
-
-Release 3.25 (release-date: 2013-02-21)
-=======================================
-
-Bug Fixes
----------
-
-- Fixed two version-specific URI bugs:
-    1. gsutil cp -r gs://bucket1 gs://bucket2 would create objects in bucket2
-       with names corresponding to version-specific URIs in bucket1 (e.g.,
-       gs://bucket2/obj#1361417568482000, where the "#1361417568482000" part was
-       part of the object name, not the object's generation).
-
-       This problem similarly caused gsutil cp -r gs://bucket1 ./dir to create
-       files names corresponding to version-specific URIs in bucket1.
-    2. gsutil rm -a gs://bucket/obj would attempt to delete the same object
-       twice, getting a NoSuchKey error on the second attempt.
-
-
-Release 3.24 (release-date: 2013-02-19)
-=======================================
-
-Bug Fixes
----------
-
-- Fixed bug that caused attempt to dupe-encode a unicode filename.
-
-Other Changes
--------------
-
-- Refactored retry logic from setmeta and chacl to use @Retry decorator.
-- Moved @Retry decorator to third_party.
-- Fixed flaky tests.
-
-
-Release 3.23 (release-date: 2013-02-16)
-=======================================
-
-Bug Fixes
----------
-
-- Make version-specific URI parsing more robust. This fixes a bug where
-  listing buckets in certain cases would result in the error
-  'BucketStorageUri' object has no attribute 'version_specific_uri'
-
-
-Release 3.22 (release-date: 2013-02-15)
-=======================================
-
-New Features
-------------
-
-- Implemented new chacl command, which makes it easy to add and remove bucket
-  and object ACL grants without having to edit XML (like the older setacl
-  command).
-- Implemented new "daisy-chain" copying mode, which allows cross-provider
-  copies to run without buffering to local disk, and to use resumable uploads.
-  This copying mode also allows copying between locations and between storage
-  classes, using the new gsutil cp -D option. (Daisy-chain copying is the
-  default when copying between providers, but must be explicitly requested for
-  the other cases to keep costs and performance expectations clear.)
-- Implemented new perfdiag command to run a diagnostic test against
-  a bucket, collect system information, and report results. Useful
-  when working with Google Cloud Storage team to resolve questions
-  about performance.
-- Added SIGQUIT (^\) handler, to allow breakpointing a running gsutil.
-
-Bug Fixes
----------
-
-- Fixed bug where gsutil setwebcfg signature didn't match with
-  HMAC authentication.
-- Fixed ASCII codec decode error when constructing tracker filename
-  from non-7bit ASCII input filename.
-- Changed boto auth plugin framework to allow multiple plugins
-  supporting requested capability, which fixes gsutil exception
-  that used to happen where a GCE user had a service account
-  configured and then ran gsutil config.
-- Changed Command.Apply method to be resilient to name expansion
-  exceptions. Before this change, if an exception was raised
-  during iteration of NameExpansionResult, the parent process
-  would immediately stop execution, causing the
-  _EOF_NAME_EXPANSION_RESULT to never be sent to child processes.
-  This resulted in the process hanging forever.
-- Fixed various bugs for gsutil running on Windows:
-  - Fixed various places from a hard-coded '/' to os.sep.
-  - Fixed a bug in the cp command where it was using the destination
-    URI's .delim property instead of the source URI.
-  - Fixed a bug in the cp command's _SrcDstSame function by
-    simplifying it to use os.path.normpath.
-  - Fixed windows bug in tests/util.py _NormalizeURI function.
-  - Fixed ZeroDivisionError sometimes happening during unit tests
-    on Windows.
-
-- Fixed gsutil rm bug that caused exit status 1 when encountered
-  non-existent URI.
-- Fixed support for gsutil cp file -.
-- Added preconditions and retry logic to setmeta command, to
-  enforce concurrency control.
-- Fixed bug in copying subdirs to subdirs.
-- Fixed cases where boto debug_level caused too much or too little
-  logging:
-  - resumable and one-shot uploads weren't showing response headers
-    when connection.debug > 0.
-  - payload was showing up in debug output when connection.debug
-    < 4 for streaming uploads.
-
-- Removed XML parsing from setacl. The previous implementation
-  relied on loose XML handling, which could truncate what it sends
-  to the service, allowing invalid XML to be specified by the
-  user. Instead now the ACL XML is passed verbatim and we rely
-  on server-side schema enforcement.
-- Added user-agent header to resumable uploads.
-- Fixed reporting bits/s when it was really bytes/s.
-- Changed so we now pass headers with API version & project ID
-  to create_bucket().
-- Made "gsutil rm -r gs://bucket/folder" remove xyz_$folder$ object
-  (which is created by various GUI tools).
-- Fixed bug where gsutil binary was shipped with protection 750
-  instead of 755.
-
-Other Changes
--------------
-
-- Reworked versioned object handling:
-  - Removed need for commands to specify -v option to parse
-    versions. Versioned URIs are now uniformly handled by all
-    commands.
-  - Refactored StorageUri parsing that had been split across
-    storage_uri and convenience; made versioned URIs render with
-    version string so StorageUri is round-trippable (boto change).
-  - Implemented gsutil cp -v option for printing the version-specific
-    URI that was just created.
-  - Added error detail for attempt to delete non-empty versioned
-    bucket. Also added versioning state to ls -L -b gs://bucket
-    output.
-  - Changed URI parsing to use pre-compiled regex's.
-  - Other bug fixes.
-
-- Rewrote/deepened/improved various parts of built-in help:
-  - Updated 'gsutil help dev'.
-  - Fixed help command handling when terminal does not have the
-    number of rows set.
-  - Rewrote versioning help.
-  - Added gsutil help text for common 403 AccountProblem error.
-  - Added text to 'gsutil help dev' about legal agreement needed
-    with code submissions.
-  - Fixed various other typos.
-  - Updated doc for cp command regarding metadata not being
-    preserved when copying between providers.
-  - Fixed gsutil ls command documentation typo for the -L option.
-  - Added HTTP scheme to doc/examples for gsutil setcors command.
-  - Changed minimum version in documentation from 2.5 to 2.6 since
-    gsutil no longer works in Python 2.5.
-  - Cleaned up/clarify/deepen various other parts of gsutil
-    built-in documentation.
-
-- Numerous improvements to testing infrastructure:
-  - Completely refactored infrastructure, allowing deeper testing
-    and more readable test code, and enabling better debugging
-    output when tests fail.
-  - Moved gslib/test_*.py unit tests to gslib/tests module.
-  - Made all tests (unit and integration, per-command and modules
-    (like naming) run from single gsutil test command.
-  - Moved TempDir functions from GsUtilIntegrationTestCase to
-    GsUtilTestCase.
-  - Made test runner message show the test function being run.
-  - Added file path support to ObjectToURI function.
-  - Disabled the test command if running on Python 2.6 and unittest2
-    is not available instead of breaking all of gsutil.
-  - Changed to pass GCS V2 API and project_id from boto config
-    if necessary in integration_testcase#CreateBucket().
-  - Fixed unit tests by using a GS-specific mocking class to
-    override the S3 provider.
-  - Added friendlier error message if test path munging fails.
-  - Fixed bug where gsutil test only cleaned up first few test files.
-  - Implemented setacl integration tests.
-  - Implemented StorageUri parsing unit tests.
-  - Implemented test for gsutil cp -D.
-  - Implemented setacl integration tests.
-  - Implemented tests for reading and seeking past end of file.
-  - Implemented and tests for it in new tests module.
-  - Changed cp tests that don't specify a Content-Type to check
-    for new binary/octet-stream default instead of server-detected
-    mime type.
-
-- Changed gsutil mv to allow moving local files/dirs to the cloud.
-  Previously this was disallowed in the belief we should be
-  conservative about deleting data from local disk but there are
-  legitimate use cases for moving data from a local dir to the
-  cloud, it's clear to the user this would remove data from the
-  local disk, and allowing it makes the tool behavior more
-  consistent with what users would expect.
-- Changed gsutil update command to insist on is_secure and
-  https_validate_certificates.
-- Fixed release no longer to include extraneous boto dirs in
-  top-level of gsutil distribution (like bin/ and docs/).
-- Changed resumable upload threshold from 1 MB to 2 MB.
-- Removed leftover cloudauth and cloudreader dirs. Sample code
-  now lives at https://github.com/GoogleCloudPlatform.
-- Updated copyright notice on code files.
-
-
-Release 3.21 (release-date: 2012-12-10)
-=======================================
-
-New Features
-------------
-
-- Added the ability for the cp command to continue even if there is an
-  error. This can be activated with the -c flag.
-- Added support for specifying src args for gsutil cp on stdin (-I option)
-
-Bug Fixes
----------
-
-- Fixed gsutil test cp, which assumed it was run from gsutil install dir.
-- Mods so we send generation subresource only when user requested
-  version parsing (-v option for cp and cat commands).
-
-Other Changes
--------------
-
-- Updated docs about using setmeta with versioning enabled.
-- Changed GCS endpoint in boto to storage.googleapis.com.
-
-
-Release 3.20 (release-date: 2012-11-30)
-=======================================
-
-New Features
-------------
-
-- Added a noclobber (-n) setting for the cp command. Existing objects/files
-  will not be overwritten when using this setting.
-
-Bug Fixes
----------
-
-- Fixed off-by-one error when reporting bytes transferred.
-
-Other Changes
--------------
-
-- Improved versioning support for the remove command.
-- Improved test runner support.
-
-
-Release 3.19 (release-date: 2012-11-26)
-=======================================
-
-New Features
-------------
-
-- Added support for object versions.
-- Added support for storage classes (including Durable Reduced Availability).
-
-Bug Fixes
----------
-- Fixed problem where cp -q prevented resumable uploads from being performed.
-- Made setwebcfg and setcors tests robust wrt XML formatting variation.
-
-Other Changes
--------------
-
-- Incorporated vapier@ mods to make version command not fail if CHECKSUM file
-  missing.
-- Refactored gsutil such that most functionality exists in boto.
-- Updated gsutil help dev instructions for how to check out source.
-
-
-Release 3.18 (release-date: 2012-09-19)
-=======================================
-
-Bug Fixes
----------
-
-- Fixed resumable upload boundary condition when handling POST request
-  when server already has complete file, which resulted in an infinite
-  loop that consumed 100% of the CPU.
-- Fixed one more place that outputted progress info when gsutil cp -q
-  specified (during streaming uploads).
-
-Other Changes
--------------
-
-- Updated help text for "gsutil help setmeta" and "gsutil help metadata", to
-  clarify and deepen parts of the documentation.
-
-
-Release 3.17 (release-date: 2012-08-17)
-=======================================
-
-Bug Fixes
----------
-
-- Fixed race condition when multiple threads attempt to get an OAuth2 refresh
-  token concurrently.
-
-Other Changes
--------------
-
-- Implemented simplified syntax for setmeta command. The old syntax still
-  works but is now deprecated.
-- Added help to gsutil cp -z option, to describe how to change where temp
-  files are written.
-
-
-Release 3.16 (release-date: 2012-08-13)
-=======================================
-
-Bug Fixes
----------
-
-- Added info to built-in help for setmeta command, to explain the syntax
-  needed when running from Windows.
-
-
-Release 3.15 (release-date: 2012-08-12)
-=======================================
-
-New Features
-------------
-
-- Implemented gsutil setmeta command.
-- Made gsutil understand bucket subdir conventions used by various tools
-  (like GCS Manager and CloudBerry) so if you cp or mv to a subdir you
-  created with one of those tools it will work as expected.
-- Added support for Windows drive letter-prefaced paths when using Storage
-  URIs.
-
-Bug Fixes
----------
-
-- Fixed performance bug when downloading a large object with Content-
-  Encoding:gzip, where decompression attempted to load the entire object
-  in memory. Also added "Uncompressing" log output if file is larger than
-  50M, to make it clear the download hasn't stalled.
-- Fixed naming bug when performing gsutil mv from a bucket subdir to
-  and existing bucket subdir.
-- Fixed bug that caused cross-provider copies into Google Cloud Storage to
-  fail.
-- Made change needed to make resumable transfer progress messages not print
-  when running gsutil cp -q.
-- Fixed copy/paste error in config file documentation for
-  https_validate_certificates option.
-- Various typo fixes.
-
-Other Changes
--------------
-
-- Changed gsutil to unset http_proxy environment variable if it's set,
-  because it confuses boto. (Proxies should instead be configured via the
-  boto config file.)
-
-
-Release 3.14 (release-date: 2012-07-28)
-=======================================
-
-New Features
-------------
-
-- Added cp -q option, to support quiet operation from cron jobs.
-- Made config command restore backed up file if there was a failure or user
-  hits ^C.
-
-Bug Fixes
----------
-
-- Fixed bug where gsutil cp -R from a source directory didn't generate
-  correct destination path.
-- Fixed file handle leak in gsutil cp -z
-- Fixed bug that caused cp -a option not to work when copying in the cloud.
-- Fixed bug that caused '/-' to be appended to object name for streaming
-  uploads.
-- Revert incorrect line I changed in previous CL, that attempted to
-  get fp from src_key object. The real fix that's needed is described in
-  https://github.com/GoogleCloudPlatform/gsutil/issues/72.
-
-Other Changes
--------------
-
-- Changed logging to print "Copying..." and Content-Type on same line;
-  refactored content type and log handling.
-
-
-Release 3.13 (release-date: 2012-07-19)
-=======================================
-
-Bug Fixes
----------
-
-- Included the fix to make 'gsutil config' honor BOTO_CONFIG environment
-  variable (which was intended to be included in Release 3.12)
-
-
-Release 3.11 (release-date: 2012-06-28)
-=======================================
-
-New Features
-------------
-
-- Added support for configuring website buckets.
-
-Bug Fixes
----------
-
-- Fixed bug that caused simultaneous resumable downloads of the same source
-  object to use the same tracker file.
-- Changed language code spec pointer from Wikipedia to loc.gov (for
-  Content-Language header).
-
-
-Release 3.10 (release-date: 2012-06-19)
-=======================================
-
-New Features
-------------
-
-- Added support for setting and listing Content-Language header.
-
-Bug Fixes
----------
-
-- Fixed bug that caused getacl/setacl commands to get a character encoding
-  exception when ACL content contained content not representable in ISO-8859-1
-  character set.
-- Fixed gsutil update not to fail under Windows exclusive file locking.
-- Fixed gsutil ls -L to continue past 403 errors.
-- Updated gsutil tests and also help dev with instructions on how to run
-  boto tests, based on recent test refactoring done to in boto library.
-- Cleaned up parts of cp help text.
-
-
-Release 3.9 (release-date: 2012-05-24)
-======================================
-
-Bug Fixes
----------
-
-- Fixed bug that caused extra "file:/" to be included in pathnames with
-  doing gsutil cp -R on Windows.
-
-
-Release 3.8 (release-date: 2012-05-20)
-======================================
-
-Bug Fixes
----------
-
-- Fixed problem with non-ASCII filename characters not setting encoding before
-  attempting to hash for generating resumable transfer filename.
-
-
-Release 3.7 (release-date: 2012-05-11)
-======================================
-
-Bug Fixes
----------
-
-- Fixed handling of HTTPS tunneling through a proxy.
-
-
-Release 3.6 (release-date: 2012-05-09)
-======================================
-
-Bug Fixes
----------
-
-- Fixed bug that caused wildcards spanning directories not to work.
-- Fixed bug that gsutil cp -z not to find available tmp space correctly
-  under Windows.
-
-
-Release 3.5 (release-date: 2012-04-30)
-======================================
-
-Performance Improvement
------------------------
-
-- Change by Evan Worley to calculate MD5s incrementally during uploads and
-  downloads. This reduces overall transfer time substantially for large
-  objects.
-
-Bug Fixes
----------
-
-- Fixed bug where uploading and moving multiple files to a bucket subdirectory
-  didn't work as intended.
-  (https://github.com/GoogleCloudPlatform/gsutil/issues/92).
-- Fixed bug where gsutil cp -r sourcedir didn't copy to specified subdir
-  if there is only one file in sourcedir.
-- Fixed bug where tracker file included a timestamp that caused it not to
-  be recognized across sessions.
-- Fixed bug where gs://bucket/*/dir wildcard matches too many objects.
-- Fixed documentation errors in help associated with ACLs and projects.
-- Changed GCS ACL parsing to be case-insensitive.
-- Changed ls to print error and exit with non-0 status when wildcard matches
-  nothing, to be more consistent with UNIX shell behavior.
-
-
-Release 3.4 (release-date: 2012-04-06)
-======================================
-
-Bug Fixes
----------
-
-- Fixed problem where resumable uploads/downloads of objects with very long
-  names would generate tracking files with names that exceeded local file
-  system limits, making it impossible to complete resumable transfers for
-  those objects. Solution was to build the tracking file name from a fixed
-  prefix, SHA1 hash of the long filename, epoch timestamp and last 16
-  chars of the long filename, which is guarantee to be a predictable and
-  reasonable length.
-- Fixed minor bug in output from 'gsutil help dev' which advised executing
-  an inconsequential test script (test_util.py).
-
-
-Release 3.3 (release-date: 2012-04-03)
-======================================
-
-Bug Fixes
----------
-
-- Fixed problem where gsutil ver and debug flags crashed when used
-  with newly generated boto config files.
-- Fixed gsutil bug in windows path handling, and make checksumming work
-  across platforms.
-- Fixed enablelogging to translate -b URI param to plain bucket name in REST
-  API request.
-
-
-Release 3.2 (release-date: 2012-03-30)
-======================================
-
-Bug Fixes
----------
-
-- Fixed problem where gsutil didn't convert between OS-specific directory
-  separators when copying individually-named files (issue 87).
-- Fixed problem where gsutil ls -R didn't work right if there was a key
-  with a leading path (like /foo/bar/baz)
-
-
-Release 3.1 (release-date: 2012-03-20)
-======================================
-
-Bug Fixes
----------
-
-- Removed erroneous setting of Content-Encoding when a gzip file is uploaded
-  (vs running gsutil cp -z, when Content-Encoding should be set). This
-  error caused users to get gsutil.tar.gz file uncompressed by the user
-  agent (like wget) while downloading, making the file appear to be of the
-  wrong size/content.
-- Fixed handling of gsutil help for Windows (previous code depended on
-  termios and fcntl libs, which are Linux/MacOS-specific).
-
-
-Release 3.0 (release-date: 2012-03-20)
-======================================
-
-Important Notes
----------------
-
-- Backwards-incompatible wildcard change:
-  The '*' wildcard now only matches objects within a bucket directory. If
-  you have scripts that depend on being able to match spanning multiple
-  directories you need to use '**' instead. For example, the command:
-
-        gsutil cp gs://bucket/*.txt
-
-  will now only match .txt files in the top-level directory.
-
-        gsutil cp gs://bucket/**.txt
-
-  will match across all directories.
-- gsutil ls now lists one directory at a time. If you want to list all objects
-  in a bucket, you can use:
-
-        gsutil ls gs://bucket/**
-
-  or:
-
-        gsutil ls -R gs://bucket
-
-New Features
-------------
-
-- Built-in help for all commands and many additional topics. Try
-  "gsutil help" for a list of available commands and topics.
-- A new hierarchical file tree abstraction layer, which makes the flat bucket
-  name space look like a hierarchical file tree. This makes several things
-  possible:
-  - copying data to/from bucket sub-directories (see “gsutil help cp”).
-  - distributing large uploads/downloads across many machines
-    (see “gsutil help cp”)
-  - renaming bucket sub-directories (see “gsutil help mv”).
-  - listing individual bucket sub-directories and for listing directories
-    recursively (see “gsutil help ls”).
-  - setting ACLs for objects in a sub-directory (see “gsutil help setacl”).
-
-- Support for per-directory (*) and recursive (**) wildcards. Essentially,
-  ** works the way * did in previous gsutil releases, and * now behaves
-  consistently with how it works in command interpreters (like bash). The
-  ability to specify directory-only wildcards also enables a number of use
-  cases, such as distributing large uploads/downloads by wildcarded name. See
-  "gsutil help wildcards" for details.
-- Support for Cross-Origin Resource Sharing (CORS) configuration. See "gsutil
-  help cors" for details.
-- Support for multi-threading and recursive operation for setacl command
-  (see “gsutil help setacl”).
-- Ability to use the UNIX 'file' command to do content type recognition as
-  an alternative to filename extensions. 
-- Introduction of new end-to-end test suite.
-- The gsutil version command now computes a checksum of the code, to detect
-  corruption and local modification when assisting with technical support.
-- The gsutil update command is no longer beta/experimental, and now also
-  supports updating from named URIs (for early/test releases).
-- Changed gsutil ls -L to also print Content-Disposition header.
-
-Bug Fixes
----------
-
-- The gsutil cp -t option previously didn't work as documented, and instead
-  Content-Type was always detected based on filename extension. Content-Type
-  detection is now the default, the -t option is deprecated (to be removed in
-  the future), and specifying a -h Content-Type header now correctly overrides
-  the filename extension based handling. For details see "gsutil help
-  metadata".
-- Fixed bug that caused multi-threaded mv command not to percolate failures
-  during the cp phase to the rm phase, which could under some circumstances
-  cause data that was not copied to be deleted.
-- Fixed bug that caused gsutil to use GET for ls -L requests. It now uses HEAD
-  for ls -L requests, which is more efficient and faster.
-- Fixed bug that caused gsutil not to preserve metadata during
-  copy-in-the-cloud.
-- Fixed bug that prevented setacl command from allowing DisplayName's in ACLs.
-- Fixed bug that caused gsutil/boto to suppress consecutive slashes in path
-  names.
-- Fixed spec-non-compliant URI construction for resumable uploads.
-- Fixed bug that caused rm -f not to work.
-- Fixed UnicodeEncodeError that happened when redirecting gsutil ls output
-  to a file with non-ASCII object names.
-
-Other Changes
--------------
-
-- UserAgent sent in HTTP requests now includes gsutil version number and OS
-  name.
-- Starting with this release users are able to get individual named releases
-  from version-named objects: gs://pub/gsutil_<version>.tar.gz
-  and gs://pub/gsutil_<version>.zip. The version-less counterparts
-  (gs://pub/gsutil.tar.gz and gs://pub/gsutil.zip) will contain the latest
-  release. Also, the gs://pub bucket is now publicly readable (so, anyone
-  can list its contents).
-
-
-Release 2.0 (release-date: 2012-01-13)
-======================================
-
-New Features
-------------
-
-- Support for for two new installation modes: enterprise and RPM.
-  Customers can now install gsutil one of three ways:
-  - Individual user mode (previously the only available mode): unpacking from
-    a gzipped tarball (gs://pub/gsutil.tar.gz) or zip file
-    (gs://pub/gsutil.zip) and running the gsutil command in place in the
-    unpacked gsutil directory.
-  - Enterprise mode (new): unpacking as above, and then running the setup.py
-    script in the unpacked gsutil directory. This allows a systems
-    administrator to install gsutil in a central location, using the Python
-    distutils facility. This mode is supported only on Linux and MacOS.
-  - RPM mode (new). A RedHat RPM can be built from the gsutil.spec.in file
-    in the unpacked gsutil directory, allowing it to be installed as part of
-    a RedHat build.
-
-- Note: v2.0 is the first numbered gsutil release. Previous releases
-  were given timestamps for versions. Numbered releases enable downstream
-  package builds (like RPMs) to define dependencies more easily.
-  This is also the first version where we began including release notes.