Hoang:
 - Edit pod file:
   + 'SVPullToRefresh', '~>0.4.1'
   + 'MNMBottomPullToRefresh', '~> 0.0'
 - Add article Cell
 - Add BaseModel, BaseManageObject
 - Add TabViewController
 - Add BookmarksViewController
 - Add ArticleViewController
 - Add ApiRequestManager (+1 sample request)