add scrollbar
分离触发方式不同时组件的执行逻辑
扩充点击外部区域tip消失的条件
optimize code structure
不写js，通过html的方式生成tooltip在触发元素上会有data-toggle=“tooltip”的标识。
但js调用生成的方式没有这个属性。
同时data-original-title属性一定存在与触发元素上。
add comment,完善文档
Merge branch 'dev' into tooltip
Merge pull request #14 from sdc-alibaba/tooltip

Tooltip 优化、升级、添加复杂触发元素支持
update index page
update checkbox
Merge branch 'dev' into scrollbar

Conflicts:
	build/css/sui-all.css
	build/css/sui-all.min.css
	build/css/sui.css
	build/css/sui.min.css
	docs/breadcrumb.html
	docs/button-groups.html
	docs/buttons.html
	docs/dialog.html
	docs/dropdown-js.html
	docs/dropdown.html
	docs/form-validate.html
	docs/forms.html
	docs/global.html
	docs/grid.html
	docs/icons.html
	docs/label.html
	docs/layout.html
	docs/msgs.html
	docs/pagination-js.html
	docs/pagination.html
	docs/progress.html
	docs/steps.html
	docs/tab-js.html
	docs/tab.html
	docs/tables.html
	docs/tooltip.html
	less/sui.less
scroll bar small
update
Merge remote-tracking branch 'sui/dev' into dev

Conflicts:
	docs/templates/download.jade
	docs/templates/index.jade
update cdn
Merge remote-tracking branch 'sui/scrollbar' into dev
Merge branch 'dev' into build
build