Improve relayout when constrained size of all nodes is changed:

- In -layoutSubviews of table and collection views, detect changes that cause a different constrained size for nodes, and trigger relayout immediately.
- Orientation change can be handled by this solution. So, no need to observe to its events.
- Update Kittens example to support iPad (easier to catch bugs on these devices) and add a title to navigation bar (looks a bit nicer).

AsyncDisplayKit/Details/ASDataController.h

@@ -156,8 +156,8 @@ typedef NSUInteger ASDataControllerAnimationOptions;
 - (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withAnimationOptions:(ASDataControllerAnimationOptions)animationOptions;
 
 /**
- * Re-measures all loaded nodes. Used for external relayout (relayout that is caused by a change in constrained size of each and every cell node,
- * for example, after an orientation change).
+ * Re-measures all loaded nodes. Used to respond to a change in size of the containing view 
+ * (e.g. ASTableView or ASCollectionView after an orientation change).
  */
 - (void)relayoutAllRows;