Support @Skip as a suite-level annotation.

CHANGELOG.md

 ### 0.12.0-beta.9
 
 * A browser test may use a custom HTML file. See [the README][custom html] for
   more information.
 
 [custom html]: https://github.com/dart-lang/test/blob/master/README.md#running-tests-with-custom-html
 
+* Tests, groups, and suites may be declared as skipped. Tests and groups are
+  skipped using the `skip` named argument; suites are skipped using the `@Skip`
+  annotation. See [the README][skip] for more information.
+
+[skip]: https://github.com/dart-lang/test/blob/master/README.md#skipping-tests
+
 * Fix running VM tests against `pub serve`.
 
 * More gracefully handle browser errors.
 
 * Properly load Dartium from the Dart Editor when possible.
 
 ### 0.12.0-beta.8
 
 * Add support for configuring timeouts on a test, group, and suite basis. Test
   and group timeouts are configured with the `timeout` named argument; suites
@@ skipping 205 matching lines @@
 * **NEW!** `expectAsyncUntil` replaces the now deprecated `expectAsyncUntil0`,
     `expectAsyncUntil1` and `expectAsyncUntil2`
 * `TestCase`:
     * Removed properties: `setUp`, `tearDown`, `testFunction`
     * `enabled` is now get-only
     * Removed methods: `pass`, `fail`, `error`
 * `interactive_html_config.dart` has been removed.
 * `runTests`, `tearDown`, `setUp`, `test`, `group`, `solo_test`, and
   `solo_group` now throw a `StateError` if called while tests are running.
 * `rerunTests` has been removed.