feat(mock): add mock module and bundle

Closes #2325

modules/angular2/mock.ts

@@ -0,0 +1,5 @@
+export * from './src/mock/mock_location_strategy';
+export {LocationStrategy} from './src/router/location_strategy';
+
+export {MockTemplateResolver} from 'angular2/src/mock/template_resolver_mock';
+export {MockXHR} from 'angular2/src/render/xhr_mock';