##Perfect Refresh Widget
为空布局的点击：
加载更多，点击加载更多：
下拉刷新更多：
1,support auto pull down Refreshing
2,support auto Loading more when footVisible.
3,show foot Itemview ,so user can click and startLoadMore
4,support EmptyView when no child item.
5,So Easy,So Simply.just 3 classes, Easy to Redefine.
any problem ,please issues,or email to me.
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zhangjianqiu007@126.com*