Merge pull request #28 from RubyLouvre/master

update
添加回到顶部
update  simplegrid
Merge pull request #196 from shirlyLoveU/master

添加返回顶部
fix visible BUG
Merge pull request #198 from gogoyqj/master

修改一些接口的规范
update
Merge branch 'master' of https://github.com/RubyLouvre/avalon.oniui.git
change dropdown doc