refactor(shadow_dom): remove ShadowDomStrategy in favor of @View(encapsulation)

BREAKING CHANGES:
- `ShadowDomStrategy` was removed. To specify the encapsulation of a component use `@View(encapsulation: ViewEncapsulation.NONE | ViewEncapsulation.EMULATED | ViewEncapsulation.NATIVE)`
- The default encapsulation strategy is now `ViewEncapsulation.EMULATED` if a component contains styles and `ViewEncapsulation.NONE` if it does not. Before this was always `NONE`.
- `ViewLoader` now returns the template as a string and the styles as a separate array

modules/angular2/src/core/annotations/decorators.ts

@@ -9,6 +9,7 @@ import {
   Class
 } from '../../util/decorators';
 import {Type} from 'angular2/src/facade/lang';
+import {ViewEncapsulation} from 'angular2/src/render/api';
 
 /**
  * Interface for the {@link Directive} decorator function.
@@ -226,7 +227,7 @@ export interface ViewFactory {
     templateUrl?: string,
     template?: string,
     directives?: List<Type | any | List<any>>,
-    renderer?: string,
+    encapsulation?: ViewEncapsulation,
     styles?: List<string>,
     styleUrls?: List<string>,
   }): ViewDecorator;
@@ -234,7 +235,7 @@ export interface ViewFactory {
     templateUrl?: string,
     template?: string,
     directives?: List<Type | any | List<any>>,
-    renderer?: string,
+    encapsulation?: ViewEncapsulation,
     styles?: List<string>,
     styleUrls?: List<string>,
   }): ViewAnnotation;

modules/angular2/src/core/annotations/view.ts

@@ -1 +1 @@
-export {View as ViewAnnotation} from '../annotations_impl/view';
+export {View as ViewAnnotation, ViewEncapsulation} from '../annotations_impl/view';