fix(worker): Add export for MessageBasedFirebaseAuth to angularfre2/worker_render path

Author: jteplitz

src/angularfire2_worker_render.ts

@@ -12,4 +12,6 @@ export const WORKER_RENDER_FIREBASE_PROVIDERS: any[] = [
     deps: [FirebaseRef]
   }),
   MessageBasedFirebaseAuth
-];
+];
+
+export {MessageBasedFirebaseAuth} from './providers/web_workers/ui/auth';