优化RefreshLayout可拉动状态

添加设置RefreshLayout可拉动状态

Merge pull request #4 from modoxie/xwf

修复下拉刷新RecyclerView回弹问题

Update AndroidManifest.xml

Update README.md

Merge pull request #2 from modoxie/xwf

Xwf

Update build.gradle

Merge pull request #1 from modoxie/xwf

下拉刷新和上拉加载