Xcode6 GM building error fixed.
Xcode6 GM building error fixed.

make sure everything gonna be all right with Xcode6 GM.

goodheart/CHTCollectionViewWaterfallLayout,cstars135/CHTCollectionViewWaterfallLayout,iguchunhui/CHTCollectionViewWaterfallLayout,809848367/CHTCollectionViewWaterfallLayout,imjerrybao/CHTCollectionViewWaterfallLayout,tianxiao12345/CHTCollectionViewWaterfallLayout,tianxiao12345/CHTCollectionViewWaterfallLayout,goodheart/CHTCollectionViewWaterfallLayout,BlessNeo/CHTCollectionViewWaterfallLayout,809848367/CHTCollectionViewWaterfallLayout,chiahsien/CHTCollectionViewWaterfallLayout,SummerHanada/CHTCollectionViewWaterfallLayout,BlessNeo/CHTCollectionViewWaterfallLayout,iguchunhui/CHTCollectionViewWaterfallLayout,SummerHanada/CHTCollectionViewWaterfallLayout,imjerrybao/CHTCollectionViewWaterfallLayout,cstars135/CHTCollectionViewWaterfallLayout,chiahsien/CHTCollectionViewWaterfallLayout