Ember.js 2.12.0 发布，JavaScript MVC 框架

Ember.js 2.12.0 发布了。Ember.js 是一个用于创建 web 应用的 JavaScript MVC 框架，采用基于字符串的 Handlebars 模板，支持双向绑定、观察者模式、计算属性（依赖其他属性动态变化）、自动更新模板、路由控制、状态机等。

本次更新内容如下：

#15000 / #15002 / #15006 / #15008 / #15009 / #15011 [PERF] Assorted performance improvements for modern browsers.
#14872 / #14871 / #14883 [PERF] Simplify action event handler.
#14360 [FEATURE factory-for] Implement factoryFor.
#14751 [DEPRECATION] Deprecate Ember.K.
#14756 [PERF] Disable costly eventManager support when unused.
#14794 [BUGFIX] Fix query param stickiness between models in ember-engines.
#14851 [PERF] only LOG_VIEW_LOOKUPS in debug
#14829 [PERF] only logLibraryVersions in debug mode
#14852 [PERF] only LOG_TRANSITIONS and LOG_TRANSITIONS_INTERNAL in debug
#14854 [PERF] only LOG_ACTIVE_GENERATION and LOG_RESOLVER in debug