chore(packaging): update import for the new file structure

modules/angular2/src/facade/async.es6

@@ -1,5 +1,5 @@
-import {int} from 'facade/src/lang';
-import {List} from 'facade/src/collection';
+import {int} from 'angular2/src/facade/lang';
+import {List} from 'angular2/src/facade/collection';
 export var Promise = window.Promise;
 
 export class PromiseWrapper {

modules/angular2/src/facade/collection.es6

@@ -1,4 +1,4 @@
-import {int, isJsObject} from 'facade/src/lang';
+import {int, isJsObject} from 'angular2/src/facade/lang';
 
 export var List = window.Array;
 export var Map = window.Map;

modules/angular2/src/facade/dom.es6

@@ -9,7 +9,7 @@ export var document = window.document;
 export var location = window.location;
 export var gc = window.gc ? () => window.gc() : () => null;
 
-import {List, MapWrapper, ListWrapper} from 'facade/src/collection';
+import {List, MapWrapper, ListWrapper} from 'angular2/src/facade/collection';
 
 export class DOM {
   static query(selector) {