refactor(core): move facades out of core

This is part of ongoing work to make core platform-independent.

BREAKING CHANGE

All private exports from 'angular2/src/core/facade/{lang,collection,exception_handler}' should be replaced with 'angular2/src/facade/{lang,collection,exception_handler}'.

modules/angular2/test/testing/fake_async_spec.ts

@@ -13,8 +13,8 @@ import {
   tick,
   xit
 } from 'angular2/testing_internal';
-import {TimerWrapper, PromiseWrapper} from 'angular2/src/core/facade/async';
-import {BaseException} from 'angular2/src/core/facade/exceptions';
+import {TimerWrapper, PromiseWrapper} from 'angular2/src/facade/async';
+import {BaseException} from 'angular2/src/facade/exceptions';
 import {Parser} from 'angular2/src/core/change_detection/change_detection';
 
 export function main() {

modules/angular2/test/testing/testing_internal_spec.ts

@@ -12,8 +12,8 @@ import {
 } from 'angular2/testing_internal';
 
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
-import {MapWrapper} from 'angular2/src/core/facade/collection';
-import {RegExpWrapper} from 'angular2/src/core/facade/lang';
+import {MapWrapper} from 'angular2/src/facade/collection';
+import {RegExpWrapper} from 'angular2/src/facade/lang';
 
 class TestObj {
   prop;

modules/angular2/test/testing/utils_spec.ts

@@ -1,5 +1,5 @@
 import {describe, it, iit, ddescribe, expect, BrowserDetection} from 'angular2/testing_internal';
-import {StringMapWrapper} from 'angular2/src/core/facade/collection';
+import {StringMapWrapper} from 'angular2/src/facade/collection';
 
 export function main() {
   describe('BrowserDetection', () => {