Update initializer blueprints.

The initializer API has changed as of 2.X, the blueprints need to be updated to address those changes. See also: emberjs/ember.js#10179

blueprints/initializer-test/files/tests/unit/initializers/__name__-test.js

@@ -2,21 +2,20 @@ import Ember from 'ember';
 import { initialize } from '<%= dependencyDepth %>/initializers/<%= dasherizedModuleName %>';
 import { module, test } from 'qunit';
 
-var registry, application;
+var application;
 
 module('<%= friendlyTestName %>', {
   beforeEach: function() {
     Ember.run(function() {
       application = Ember.Application.create();
-      registry = application.registry;
       application.deferReadiness();
     });
   }
 });
 
 // Replace this with your real tests.
 test('it works', function(assert) {
-  initialize(registry, application);
+  initialize.call(initialize, application);
 
   // you would normally confirm the results of the initializer here
   assert.ok(true);

blueprints/initializer/files/__root__/initializers/__name__.js

@@ -1,4 +1,4 @@
-export function initialize(/* container, application */) {
+export function initialize(/* application */) {
   // application.inject('route', 'foo', 'service:foo');
 }