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
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
Merge branch 'master' of https://github.com/lhyqy5/material_design_zh
Merge pull request #88 from lhyqy5/master

添加锚点id属性中缺少的引号
添加 Jekyll 头部：dialogs
添加 Jekyll 头部：chips
添加 Jekyll 头部：dividers
章内目录移除：tooltips
章内目录移除：metrics-and-keylines
remove content and modify subtitle format
format
merge
conflict