feat(router.js): export routerDirectives

modules/angular2/router.js

@@ -15,11 +15,19 @@ export * from './src/router/route_config_decorator';
 
 import {BrowserLocation} from './src/router/browser_location';
 import {Router, RootRouter} from './src/router/router';
+import {RouterOutlet} from './src/router/router_outlet';
+import {RouterLink} from './src/router/router_link';
 import {RouteRegistry} from './src/router/route_registry';
 import {Pipeline} from './src/router/pipeline';
 import {Location} from './src/router/location';
 import {appComponentTypeToken} from './src/core/application_tokens';
 import {bind} from './di';
+import {CONST_EXPR} from './src/facade/lang';
+
+export const routerDirectives:List = CONST_EXPR([
+  RouterOutlet,
+  RouterLink
+]);
 
 export var routerInjectables:List = [
   RouteRegistry,