fixed build process by adding comment

Author: alexwolfe

modules/angular2/src/core/compiler/view_container_ref.js

@@ -6,7 +6,9 @@ import * as avmModule from './view_manager';
 
 import {ElementRef} from './element_ref';
 import {ViewRef, ProtoViewRef, internalView} from './view_ref';
-
+/**
+ * @exportedAs angular2/core
+ */
 export class ViewContainerRef {
   _viewManager: avmModule.AppViewManager;
   _element: ElementRef;