Roll Observatory packages and add a roll script

packages/usage/changelog.md

Index: packages/usage/changelog.md
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+# Changelog
+
+## 1.0.0
+- Rev'd to 1.0.0!
+- No other changes from the `0.0.6` release
+
+## 0.0.6
+- Added a web example
+- Added a utility method to time async events (`Analytics.startTimer()`)
+- Updated the readme to add information about when we send analytics info
+
+## 0.0.5
+
+- Catch errors during pings to Google Analytics, for example in case of a
+  missing internet connection
+- Track additional browser data, such as screen size and language
+- Added tests for `usage` running in a dart:html context
+- Changed to a custom implementation of UUID; saved ~376k in compiled JS size
+
+## 0.0.4
+
+- Moved `sanitizeStacktrace` into the main library
+
+## 0.0.3
+
+- Replaced optional positional arguments with named arguments
+- Added code coverage! Thanks to https://github.com/Adracus/dart-coveralls and
+  coveralls.io.
+
+## 0.0.2
+
+- Fixed a bug in `analytics.sendTiming()`
+
+## 0.0.1
+
+- Initial version, created by Stagehand