Merge pull request #573 from linlingyu/dev

[BugFix] 发现each.foreach一个错误，当遍历项存在0值时
Merge pull request #574 from linlingyu/dev

Dev
Merge pull request #575 from linlingyu/dev

[Change] 更换demo中的版本
[testcase]修改不通过的用例
Merge pull request #576 from tianlili/dev

[testcase]修改不通过的用例
Merge pull request #577 from linlingyu/dev

Dev
Merge pull request #578 from linlingyu/dev

[BugFix] 禁止draggable拖拽表单元素
api & demos
Merge branch 'dev' of https://github.com/BaiduFE/Tangram2 into dev
Merge pull request #579 from liaoxuezhi/dev

api & demos
Merge branch 'dev' of https://github.com/BaiduFE/Tangram2 into dev
[Change] 重新加入zh-CN语言包到打包源码中