feat(router): support deep-linking to anywhere in the app

Closes #2642

modules/angular2/src/router/async_route_handler.ts

@@ -0,0 +1,21 @@
+import {RouteHandler} from './route_handler';
+import {Promise, PromiseWrapper} from 'angular2/src/facade/async';
+import {isPresent, Type} from 'angular2/src/facade/lang';
+
+export class AsyncRouteHandler implements RouteHandler {
+  _resolvedComponent: Promise<any> = null;
+  componentType: Type;
+
+  constructor(private _loader: Function) {}
+
+  resolveComponentType(): Promise<any> {
+    if (isPresent(this._resolvedComponent)) {
+      return this._resolvedComponent;
+    }
+
+    return this._resolvedComponent = this._loader().then((componentType) => {
+      this.componentType = componentType;
+      return componentType;
+    });
+  }
+}