Bring in the latest pub and barback.

CHANGELOG.md

 ## 1.12.0
 
 ### Core library changes
 
 * `dart:html`
   * `NodeTreeSanitizer` added the `const trusted` field. It can be used
     instead of defining a `NullTreeSanitizer` class when calling
     `setInnerHtml` or other methods that create DOM from text. It is
     also more efficient, skipping the creation of a `DocumentFragment`.
 
 * `dart:io`
   * Added two new file modes, `WRITE_ONLY` and `WRITE_ONLY_APPEND` for
     opening a file write only.
     [eaeecf2](https://github.com/dart-lang/sdk/commit/eaeecf2ed13ba6c7fbfd653c3c592974a7120960)
   * Change stdout/stderr to binary mode on Windows.
     [4205b29](https://github.com/dart-lang/sdk/commit/4205b2997e01f2cea8e2f44c6f46ed6259ab7277)
 
 ### Tool changes
 
 * Pub
 
-  * `pub run` starts up faster for executables that don't import transformed
-    code.
+  * `pub run` and `pub global run`
+
+    * Faster start time for executables that don't import transformed code.
+
+    * Binstubs for globally-activated executables are now written in the system
+      encoding, rather than always in `UTF-8`. To update existing executables,
+      run `pub cache repair`.
 
   * `pub get` and `pub upgrade`
 
     * Pub will now generate a ".packages" file in addition to the "packages"
       directory when running `pub get` or similar operations, per the
       [package spec proposal][]. Pub now has a `--no-package-symlinks` flag that
       will stop "packages" directories from being generated at all.
 
     * An issue where HTTP requests were sometimes made even though `--offline`
       was passed has been fixed.
@@ skipping 12 matching lines @@
       level of the Git repository.
 
   * Barback integration
 
     * A crashing bug involving transformers that only apply to non-public code
       has been fixed.
 
     * A stack overflow caused by a transformer being run multiple times on the
       package that defines it has been fixed.
 
+    * A transformer that tries to read a non-existent asset in another package
+      will now be re-run if that asset is later created.
+
 [package spec proposal]: https://github.com/lrhn/dep-pkgspec
 
 ## 1.11.1
 
 ### Tool changes
 
 * Pub will always load Dart SDK assets from the SDK whose `pub` executable was
   run, even if a `DART_SDK` environment variable is set.
 
 ## 1.11.0 - 2015-06-25
@@ skipping 332 matching lines @@
     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.