refactor(core): Move LifeCycle functionality into ApplicationRef.

BREAKING CHANGE:

Before: constructor(@Inject(LifeCycle) lifecycle) { lifecycle.tick(); }
After: constructor(@Inject(ApplicationRef) appRef) { appRef.tick(); }

Closes #5008

modules/angular2/src/mock/mock_application_ref.ts

@@ -20,5 +20,7 @@ export class MockApplicationRef extends ApplicationRef {
 
   dispose(): void {}
 
+  tick(): void {}
+
   get componentTypes(): Type[] { return null; };
 }