Merge pull request #471 from zhanghongyan/dev

Dev
Merge branch 'dev'
Merge branch 'dev'
Merge branch 'master' of https://github.com/BaiduFE/Tangram2
Merge branch 'dev' of https://github.com/BaiduFE/Tangram2
[change]baidu.fx更新
[Change]添加DEMO
修改selectable多实例rubberSelect会被其他实例清除。
Merge pull request #519 from ChineseDron/dev

优化事件 queue.get
Merge branch 'dev' of https://github.com/BaiduFE/Tangram2 into plugin
修正selectable单页多实例时的bug。
Merge pull request #520 from wangxiao/plugin

修正单页多实例的bug
[Change]将 base.Class 里的注册函数handler的存储方式做了优化，以{handler, once} 作为单元以存储
Merge pull request #521 from huangfangrong/dev

[Change]将 base.Class 里的注册函数handler的存储方式做了优化，以{handler, once} 作为单元以存储
[Change] 修改ajax使用baidu.id.key为baidu.key
[Change] id接口去掉baidu.id.key（在baidu.js中已经存在为baidu.key），修改guid解决多版本冲突问题
[Change] 重新整理callbacks和deferred
[Doc] width和height接口注释修改
[Change] first接口加入1.x code注释
[Bugfix] off接口增加判断，防止window之类的对象不能解除事件绑定
[TestCase] 由于修改baidu.id带来的测试用例修改
Merge pull request #522 from linlingyu/dev

[Change] 修改ajax使用baidu.id.key为baidu.key
[Change] 修改Uglifyjs为2.2.3版本
Merge pull request #523 from linlingyu/dev

[Change] 修改Uglifyjs为2.2.3版本
[Feature] 将Deferred中的when拆分出来
Merge pull request #524 from linlingyu/dev

[Feature] 将Deferred中的when拆分出来