Shim backburner join until we are sure Ember has it

packages/ember-data/lib/system/store.js

@@ -25,6 +25,31 @@ import { Model } from "ember-data/system/model";
 //Stanley told me to do this
 var Backburner = Ember.__loader.require('backburner')['default'] || Ember.__loader.require('backburner')['Backburner'];
 
+//Shim Backburner.join
+if (!Backburner.prototype.join) {
+  var slice = [].slice;
+  var isString = function(suspect) {
+    return typeof suspect === 'string';
+  };
+
+  Backburner.prototype.join = function(target, method /*, args */) {
+    if (this.currentInstance) {
+      if (!method) {
+        method = target;
+        target = null;
+      }
+
+      if (isString(method)) {
+        method = target[method];
+      }
+
+      return method.apply(target, slice.call(arguments, 2));
+    } else {
+      return this.run.apply(this, arguments);
+    }
+  };
+}
+
 
 var get = Ember.get;
 var set = Ember.set;