Ember.js v2.9.0-beta.2 发布，JavaScript 框架

Ember.js v2.9.0-beta.2 发布了，Ember是一个雄心勃勃的Web应用程序，消除了样板，并提供了一个标准的应用程序架构的JavaScript框架。本次更新如下：

#14237 [BUGFIX] Ensure Engine Routes are deactivated before destruction
#14176 [BUGFIX] Ensure Controller#transitionToRoute and Route#intermediateTransitionTo work in Engines
#14244 [BUGFIX] Ensure params and hash are frozen in debug builds.
#14245 [BUGFIX] Lookup partials from the current owner when rendering an Engines templates.
#14247 [BUGFIX] Make this.getAttr an alias for this.get.
#14252 [BUGFIX] Don’t delete moduleName from the generated template compilation options.
#14253 [BUGFIX] Prevent duplicated Ember.meta invocations.
#14271 [BUGFIX] Ensure undefined and null values are not rendered as attributes or properties on initial render.
#14272 [BUGFIX] Fix issues with Transition#isActive being falsey incorrectly.