Merge branch 'dev' of https://github.com/sdc-alibaba/sui into dev
完善复杂触发元素时复杂tip的逻辑。升级文档
更换处理tip里内容换行情况的方式
增加参数width，手工设置宽度，注意和widthlimit不同。
Merge branch 'dev' of https://github.com/sdc-alibaba/sui into dev
Merge branch 'dev' into tooltip
widthlimit默认设置
Merge branch 'dev' of https://github.com/sdc-alibaba/sui into dev
Merge branch 'dev' into tooltip
update checkbox
change forms horizental from display:inline-block to display: table-cell
update doc
Merge branch 'dev' into forms
update form doc
Merge pull request #16 from sdc-alibaba/forms

change forms horizental from display:inline-block to display: table-cell
update doc
update comments
Merge pull request #15 from sdc-alibaba/tooltip

Tooltip 增加参数width，适应复杂触发元素改造
update sidenav
update sidenav icon