feat(bootstrap): remove the need for explicit reflection setup in bootstrap code

BREAKING CHANGES:

Dart applications and TypeScript applications meant to transpile to Dart must now
import `package:angular2/bootstrap.dart` instead of `package:angular2/angular2.dart`
in their bootstrap code. `package:angular2/angular2.dart` no longer export the
bootstrap function. The transformer rewrites imports of `bootstrap.dart` and calls
to `bootstrap` to `bootstrap_static.dart` and `bootstrapStatic` respectively.

modules/angular2/test/transform/integration/two_annotations_files/index.dart

@@ -1,6 +1,6 @@
 library web_foo;
 
-import 'package:angular2/src/core/application.dart';
+import 'package:angular2/bootstrap.dart';
 import 'package:angular2/src/reflection/reflection_capabilities.dart';
 import 'bar.dart';