Merge pull request #1 from miaojing/master

响应式media query兼容实现和picture模拟实现
Merge pull request #2 from miaojing/master

修改md文件 demo地址改为绝对路径
Merge pull request #3 from miaojing/master

修改md文件 添加响应式模式
build
修改打包配置
增加组件配置
chg index.md
merge remote branch
chg gruntfile for rename respondtools