feat(router): adds the router to the self-executing bundle.

Due to limitation of system build, the router cannot have its own sfx
bundle.

Fixes an issue with RouteConfig decorator by moving it into its own
file.

modules/angular2/src/router/route_config_annotation.es6

@@ -1,5 +1 @@
 export {RouteConfig as RouteConfigAnnotation} from './route_config_impl';
-
-import {makeDecorator} from 'angular2/src/util/decorators';
-
-export var RouteConfig = makeDecorator(RouteConfig);

modules/angular2/src/router/route_config_decorator.dart

@@ -0,0 +1,3 @@
+library angular2.router.route_config_decorator;
+
+/** This file is intentionally empty, as Dart does not have decorators */

modules/angular2/src/router/route_config_decorator.es6

@@ -0,0 +1,5 @@
+import {RouteConfig as RouteConfigAnnotation} from './route_config_impl';
+import {makeDecorator} from 'angular2/src/util/decorators';
+
+export var RouteConfig = makeDecorator(RouteConfigAnnotation);
+