修改进度
Merge pull request #18 from vincent4j/master

认领：Principles
Merge pull request #19 from vincent4j/master

认领：Principles
translated responsive interaction chapter
Merge pull request #20 from 7heaven/master

translated responsive interaction chapter
Update responsive-interaction.md
Merge pull request #21 from 7heaven/master

correct typo in responsive-interaction.md
添加学习指南文档
Merge pull request #22 from IceskYsl/master

添加学习指南文档
添加学习指南文档
添加学习指南文档
Merge pull request #23 from IceskYsl/master

添加学习指南文档
添加领取任务
添加material for android L
解决冲突
Merge pull request #24 from IceskYsl/master

添加领取任务
arjinmc 认领 Color
完成规范编写,资源置换到本地
本地修改提交
添加一个演示图