by qianjun;fix dropdown bug;add onInit callback
by qianjun;fix scrollbar
by qianjun;change scroll compute
Merge branch 'master' of https://github.com/RubyLouvre/avalon.oniui.git
by qianjun;change scroll compute
by qianjun;fix scrollbar compute bug
Merge pull request #89 from gogoyqj/master

修复simplegrid竖直方向带滚动条，宽度计算不准的bug