build: adding basic e2e testing infrastructure

modules/playground/src/async/index.html

@@ -9,6 +9,6 @@
     Loading...
   </async-app>
 
-  $SCRIPTS$
+  <script src="../bootstrap.js"></script>
 </body>
 </html>

modules/playground/src/async/index.ts

@@ -1,7 +1,7 @@
-import {bootstrap} from '@angular/platform-browser';
+import {bootstrap} from '@angular/platform-browser-dynamic';
 import {Component} from '@angular/core';
 import {NgIf} from '@angular/common';
-import {TimerWrapper} from '@angular/facade';
+import {TimerWrapper} from '@angular/core/src/facade/async';
 
 @Component({
   selector: 'async-app',