Quxiaolei / BoardSelectVC

a boardSelectVC which show like 今日头条

####reference: 1.数据更新及列表书写规范

2.collectionView重排功能 (英文原版)

uicollectionview-reordering

3.官方文档

4.相关问题处理

http://stackoverflow.com/questions/13698275/uicollectionview-moveitematindexpathtoindexpath-issues-moving-items-not-on-scr

http://stackoverflow.com/questions/19524468/uicollectionview-reorder-animation