chore: upgrade to new Zone.js API v0.6.2

BREAKING CHANGE

Removed deprecated API from NgZone
- `NgZone.overrideOnTurnStart`
- `NgZone.overrideOnTurnDone`
- `NgZone.overrideOnEventDone`
- `NgZone.overrideOnErrorHandler`

Rename NgZone API
- `NgZone.onTurnStart` => `NgZone.onUnstable`
- `NgZone.onTurnDone` => `NgZone.onMicrotaskEmpty`
- `NgZone.onEventDone` => `NgZone.onStable`

Closes #7345

modules/angular2/test/core/change_detection/differs/default_iterable_differ_spec.ts

@@ -128,7 +128,7 @@ export function main() {
             }));
       });
 
-      it('should handle swapping element', () => {
+      it('should handle incremental swapping element', () => {
         let l = ['a', 'b', 'c'];
         differ.check(l);