更多的meta 标签参考
•COMPLETE LIST OF HTML META TAGS
•18 Meta Tags Every Webpage Should Have in 2013

参考文章：
•https://github.com/yisibl/blog/issues/1
•https://gist.github.com/paddingme/6182708733917ae36331
•http://amazeui.org/css/
•http://www.douban.com/note/170560091/