add videoes on components/menu.md
Merge remote-tracking branch 'upstream/master'
Merge pull request #82 from IceskYsl/master

添加jekyll用的头信息
modify some context for reading better :)
modify some links for menu.md
Merge pull request #83 from codediving/master

翻译完毕
完成tooltips的翻译
Merge branch 'master' of https://github.com/1sters/material_design_zh
add script
添加 layout-principles 图片，中尺寸
Merge pull request #84 from vincent4j/master

添加 layout-principles 图片，中尺寸
删除 layout-principles 大尺寸图片
Merge remote-tracking branch 'up/master'
Merge pull request #85 from vincent4j/master

删除 layout-principles 大尺寸图片
Merge pull request #86 from lhyqy5/master

完成tooltips的翻译
添加jekyll用的头信息
Merge pull request #87 from lhyqy5/master

添加jekyll用的头信息
Guide：添加文章，Google 设计师谈论 Material Design
添加锚点id熟悉中缺少的引号
Merge pull request #88 from lhyqy5/master

添加锚点id属性中缺少的引号