for fixup - keep RootTestComponent around, but deprecate

modules/angular2/testing.ts

@@ -7,6 +7,10 @@
  *
  */
 export * from './src/testing/testing';
-export {ComponentFixture, TestComponentBuilder} from './src/testing/test_component_builder';
+export {
+  ComponentFixture,
+  RootTestComponent,
+  TestComponentBuilder
+} from './src/testing/test_component_builder';
 export * from './src/testing/test_injector';
 export * from './src/testing/fake_async';