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/core/render/dom/dom_renderer_integration_spec.ts

@@ -13,7 +13,7 @@ import {
   SpyObject,
 } from 'angular2/testing_internal';
 
-// import {MapWrapper} from 'angular2/src/core/facade/collection';
+// import {MapWrapper} from 'angular2/src/facade/collection';
 // import {DOM} from 'angular2/src/core/dom/dom_adapter';
 
 // import {DomTestbed, TestRootView, elRef} from './dom_testbed';

modules/angular2/test/core/render/dom/events/event_manager_spec.ts

@@ -15,7 +15,7 @@ import {
   DomEventsPlugin
 } from 'angular2/src/core/render/dom/events/event_manager';
 import {NgZone} from 'angular2/src/core/zone/ng_zone';
-import {ListWrapper, Map, MapWrapper} from 'angular2/src/core/facade/collection';
+import {ListWrapper, Map, MapWrapper} from 'angular2/src/facade/collection';
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
 
 export function main() {

modules/angular2/test/core/render/view_factory_spec.ts

@@ -11,8 +11,8 @@ import {
   stringifyElement
 } from 'angular2/testing_internal';
 
-import {isPresent} from 'angular2/src/core/facade/lang';
-import {MapWrapper, ListWrapper} from 'angular2/src/core/facade/collection';
+import {isPresent} from 'angular2/src/facade/lang';
+import {MapWrapper, ListWrapper} from 'angular2/src/facade/collection';
 import * as appCmds from 'angular2/src/core/linker/template_commands';
 import {createRenderView, NodeFactory} from 'angular2/src/core/render/view_factory';
 import {RenderTemplateCmd, RenderBeginElementCmd} from 'angular2/src/core/render/api';