feat(injector): initial implementaion of dynamic injector

modules/facade/src/async.dart

@@ -0,0 +1,14 @@
+library angular.core.facade.async;
+
+import 'dart:async';
+export 'dart:async' show Future;
+
+class FutureWrapper {
+  static Future value(obj) {
+    return new Future.value(obj);
+  }
+
+  static Future wait(List<Future> futures){
+    return Future.wait(futures);
+  }
+}