修复.invisible和.initials的潜在bug，增加img-replace的快捷方式ir，修复文档
更新文档中的typography模块
修复est-layout-horizontal-list的bug，增加文档
Merge branch 'master' of https://github.com/ecomfe/est into ecomfe-master
Merge branch 'gh-pages' of https://github.com/ecomfe/est into ecomfe-gh-pages

Conflicts:
	src/util.less