feat(core): remove the (^ syntax and make all DOM events bubbling

BREAKING CHANGE

Before
<div (^click)="onEventHandler()">
  <button></button>
</div>

After
<div (click)="onEventHandler()">
  <button></button>
</div>

Closes #3864

modules/angular2/src/router/router_link.ts

@@ -38,7 +38,7 @@ import {Instruction, stringifyInstruction} from './instruction';
   selector: '[router-link]',
   properties: ['routeParams: routerLink'],
   host: {
-    '(^click)': 'onClick()',
+    '(click)': 'onClick()',
     '[attr.href]': 'visibleHref',
     '[class.router-link-active]': 'isRouteActive'
   }