feat(web-workers) Add WebWorker Renderer

Allows angular apps to be rendered from the webworker!
Closes #3052, #3053, and #3097

modules/angular2/test/render/dom/dom_renderer_integration_spec.ts

@@ -276,5 +276,5 @@ export function main() {
   });
 }
 
-var someComponent = DirectiveMetadata.create(
+export var someComponent = DirectiveMetadata.create(
     {id: 'someComponent', type: DirectiveMetadata.COMPONENT_TYPE, selector: 'some-comp'});

modules/angular2/test/render/dom/dom_testbed.ts

@@ -68,7 +68,7 @@ export class DomTestbed {
               @Inject(DOCUMENT_TOKEN) document) {
     this.renderer = renderer;
     this.compiler = compiler;
-    this.rootEl = el('<div id="root"></div>');
+    this.rootEl = el('<div id="root" class="rootElem"></div>');
     var oldRoots = DOM.querySelectorAll(document, '#root');
     for (var i = 0; i < oldRoots.length; i++) {
       DOM.remove(oldRoots[i]);