Merge pull request #722 from nguyenhuy/RelayoutCellAPI

Add relayout item/row APIs to ASTableView and ASCollectionView

AsyncDisplayKit/ASTableView.h

@@ -214,6 +214,18 @@
  */
 - (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
 
+/**
+ * Relayouts the specified row using a given animation effect.
+ *
+ * @param indexPath The index path identifying the row to relayout.
+ *
+ * @param animation A constant that indicates how the relayout is to be animated. See UITableViewRowAnimation.
+ *
+ * @discussion This method must be called from the main thread. The relayout is excuted on main thread. 
+ * The node of the specified row must be updated to cause layout changes before this method is called.
+ */
+- (void)relayoutRowAtIndexPath:(NSIndexPath *)indexPath withRowAnimation:(UITableViewRowAnimation)animation;
+
 /**
  * Moves the row at a specified location to a destination location.
  *