refactor(core): support non reflective bootstrap.

This changes Angular so that it can be used without reflection (assuming a codegen for injectors).

BREAKIKNG CHANGE:
- Drops `APP_COMPONENT` provider. Instead, inject
  `ApplicationRef` and read its `componentTypes` property.
- long form bootstrap has changed into the following:
  ```
  var platform = createPlatform(ReflectiveInjector.resolveAndCreate(BROWSER_PROVIDERS));
  var appInjector =
    ReflectiveInjector.resolveAndCreate([BROWSER_APP_PROVIDERS, appProviders], platform.injector);
  coreLoadAndBootstrap(appInjector, MyApp);
  ```

modules/angular2/test/router/integration/bootstrap_spec.ts

@@ -54,7 +54,7 @@ export function main() {
     ]);
 
     // do not refactor out the `bootstrap` functionality. We still want to
-    // keep this test around so we can ensure that bootstrapping a router works
+    // keep this test around so we can ensure that bootstrap a router works
     it('should bootstrap a simple app', inject([AsyncTestCompleter], (async) => {
          var fakeDoc = DOM.createHtmlDocument();
          var el = DOM.createElement('app-cmp', fakeDoc);

modules/angular2/test/router/integration/impl/fixture_components.ts

@@ -153,7 +153,8 @@ export class DynamicLoaderCmp {
       this._componentRef.destroy();
       this._componentRef = null;
     }
-    return this._dynamicComponentLoader.loadNextToLocation(DynamicallyLoadedComponent, viewport)
+    return this._dynamicComponentLoader.loadNextToLocation(DynamicallyLoadedComponent,
+                                                           this.viewport)
         .then((cmp) => { this._componentRef = cmp; });
   }
 }