fix dropdown scroll bug in tab
dialog scroll bug doc
rm dropdown backdrop
fix dropdown height bug
update doc
fix doc bug
add height param,modify style
update docs
merge
add import in sui.js
update filesize.js
update sidenav
add filesize.jade
update filesizejs
update docs
Merge pull request #22 from sdc-alibaba/dialog

Dialog 对话框添加height参数,对应样式调整，更新文档
Merge pull request #23 from sdc-alibaba/filesize

$.filesize 一个超轻量的工具，将byte级别的正数（通常表征filesize）转成对人阅读更友好的格式。
change that to self
add cancelHide and cancelHidden event
update js and doc