add z-index settings
add min-height to compatibility.less
changed fixed-header-layout to full-height-layout and add footer settings
add .hide-text for util.less
add `est-` prefixes for layout mixins
enhance border-radius, box-shadow, transition and transform-related mixins
update compatibility.less and full-height-layout
fix comment and remove test implementations from layout.less
update default config for full-height-layout
init typography

移动修改了util中的text-overflow和hide-text
simplify mixin API for sticky header and fixed header/footer, remove IE 6 support
Merge pull request #1 from ecomfe/master

merge
增加all.css，和几个排版相关的mixin，以及变量default-font-size
fix box-shadow bug and improved transition to support transform, add some variables
增加新的typography mixin
fix bug
add import
add package.json and doc
fix anchor reference
fix transition-property bug