don't use facade Promises for now

ionic/util/dom.ts

@@ -1,6 +1,3 @@
-// Use Angular's promise which doesn't swallow exceptions
-import {Promise} from 'angular2/src/facade/async';
-
 const nativeRaf = window.requestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.mozRequestAnimationFrame;