Merge pull request #442 from machty/mf-replace_inefficient_use_of_run_once

Fix inefficient use of run.once by EmberEnvironment.async

Author: maxfierke

addon/-private/ember-environment.js

@@ -2,15 +2,15 @@ import Ember from 'ember';
 import { defer } from 'rsvp';
 import { Environment } from './external/environment';
 import { assert } from '@ember/debug';
-import { join, next, once } from '@ember/runloop';
+import { join, next, schedule } from '@ember/runloop';
 
 export class EmberEnvironment extends Environment {
   assert(...args) {
     assert(...args);
   }
 
   async(callback) {
-    join(() => once(null, callback));
+    join(() => schedule('actions', callback));
   }
 
   reportUncaughtRejection(error) {