* cache/quickstart sync before making Dart edits
* quickstart updates for Dart
* cache/guide/index sync before making Dart edits
* guide/index updates for Dart
* learning-angular for Dart
* guide/setup for Dart
* refresh cache/tutorial/index
Contributes to #2407
- Dropped the “2” in “Angular 2” and “angular2_*” where appropriate.
- Did a partial sync of `_cache/guide/pipes.jade`
- In quickstart, changed `Try changing the message to "Hello Angular
2!”` to `Try changing the message to "Hello Again Angular!”`.
* update to beta.22
* Dart SDK 1.19.0 or later is required
* minor edits to sample app titles to e2e tests pass
* Renamed “Angular 2” to “Angular” so that shared e2e tests pass.
* Tweak to QS prose.
* docs(quickstart): post-RC5 Dart resync
- Resync Dart QS prose with TS, post RC5.
- Added to-be-shared Jade `var` definitions to `_util-fns.jade`.
- Delete cached QS jade file.
- Eliminate the stub file `styles.1.css` in favor of a `docregion` in
the main `styles.css`.
This commit requires a `gulp add-example-boilerplate` after pulling it in.
Contributes to #2077.
* post-review edits