refactor(core): type ComponentRef, ComponentFactory and ComponentFixture by the component type

BREAKING CHANGE:
- `ComponetRef`, `ComponentFactory`, `ComponentFixture` now all require a type
  parameter with the component type.
Closes #8361

modules/angular2/platform/browser.ts

@@ -121,7 +121,7 @@ export function browserPlatform(): PlatformRef {
  */
 export function bootstrap(
     appComponentType: Type,
-    customProviders?: Array<any /*Type | Provider | any[]*/>): Promise<ComponentRef> {
+    customProviders?: Array<any /*Type | Provider | any[]*/>): Promise<ComponentRef<any>> {
   reflector.reflectionCapabilities = new ReflectionCapabilities();
   var appInjector = ReflectiveInjector.resolveAndCreate(
       [BROWSER_APP_PROVIDERS, isPresent(customProviders) ? customProviders : []],

modules/angular2/platform/browser_static.ts

@@ -47,7 +47,7 @@ export function browserStaticPlatform(): PlatformRef {
  */
 export function bootstrapStatic(appComponentType: Type,
                                 customProviders?: Array<any /*Type | Provider | any[]*/>,
-                                initReflector?: Function): Promise<ComponentRef> {
+                                initReflector?: Function): Promise<ComponentRef<any>> {
   if (isPresent(initReflector)) {
     initReflector();
   }

modules/angular2/platform/worker_app.dart

@@ -39,7 +39,7 @@ PlatformRef workerAppPlatform(SendPort renderSendPort) {
   return platform;
 }
 
-Future<ComponentRef> bootstrapApp(
+Future<ComponentRef<dynamic>> bootstrapApp(
     SendPort renderSendPort,
     Type appComponentType,
     [List<dynamic /*Type | Provider | any[]*/> customProviders]) {

modules/angular2/platform/worker_app.ts

@@ -44,7 +44,7 @@ export function workerAppPlatform(): PlatformRef {
 
 export function bootstrapApp(
     appComponentType: Type,
-    customProviders?: Array<any /*Type | Provider | any[]*/>): Promise<ComponentRef> {
+    customProviders?: Array<any /*Type | Provider | any[]*/>): Promise<ComponentRef<any>> {
   var appInjector = ReflectiveInjector.resolveAndCreate(
       [WORKER_APP_APPLICATION, isPresent(customProviders) ? customProviders : []],
       workerAppPlatform().injector);