style(dart): Format with dartfmt v0.2.0

Format all pure Dart code with package:dart_style v0.2.0

Command:
```
find -type f -name "*.dart" | xargs dartformat -w
```

modules/angular2/src/core/compiler/query_list.dart

@@ -10,7 +10,8 @@ import './interface_query.dart';
  * In the future this class will implement an Observable interface.
  * For now it uses a plain list of observable callbacks.
  */
-class QueryList<T> extends Object with IterableMixin<T>
+class QueryList<T> extends Object
+    with IterableMixin<T>
     implements IQueryList<T> {
   List<T> _results = [];
   List _callbacks = [];