Add todoapp benchmark

bench/implementations/ember-2.6.3/app/app.js

@@ -0,0 +1,18 @@
+import Ember from 'ember';
+import Resolver from './resolver';
+import loadInitializers from 'ember-load-initializers';
+import config from './config/environment';
+
+let App;
+
+Ember.MODEL_FACTORY_INJECTIONS = true;
+
+App = Ember.Application.extend({
+	modulePrefix: config.modulePrefix,
+	podModulePrefix: config.podModulePrefix,
+	Resolver
+});
+
+loadInitializers(App, config.modulePrefix);
+
+export default App;