Deprecate store.pushMany in favor of store.push

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

@@ -1901,6 +1901,7 @@ Store = Service.extend({
   */
   pushMany: function(modelName, datas) {
     Ember.assert('Passing classes to store methods has been removed. Please pass a dasherized string instead of '+ Ember.inspect(modelName), typeof modelName === 'string');
+    Ember.deprecate('Using store.pushMany() has been deprecated since store.push() now handles multiple items. You should use store.push() instead.');
     var length = datas.length;
     var result = new Array(length);
 

packages/ember-data/tests/unit/store/push-test.js

@@ -584,3 +584,15 @@ test("Calling push with unknown keys should not warn by default", function() {
     });
   }, /The payload for 'person' contains these unknown keys: \[emailAddress,isMascot\]. Make sure they've been defined in your model./);
 });
+
+test("Calling pushMany is deprecated", function() {
+  var person1, person2;
+  expectDeprecation(function() {
+    run(function() {
+      person1 = { id: 1, firstName: 'John', lastName: 'Smith' };
+      person2 = { id: 2, firstName: 'Suzie', lastName: 'Q' };
+
+      store.pushMany('person', [person1, person2]);
+    });
+  }, 'Using store.pushMany() has been deprecated since store.push() now handles multiple items. You should use store.push() instead.');
+});