Update manual display logic

Postpone manual display until a future release when it can be called on any thread. Provide the current node manual display logic as a category on ASDisplayNode only available for ASRangeController. Deprecate -displayImmediately.

AsyncDisplayKit/ASDisplayNode.mm

@@ -434,33 +434,6 @@ void ASDisplayNodePerformBlockOnMainThread(void (^block)())
   _contentsScaleForDisplay = contentsScaleForDisplay;
 }
 
-- (void)display
-{
-  ASDisplayNodeAssertMainThread();
-  ASDisplayNodeAssert(self.nodeLoaded, @"backing store must be loaded before calling -display");
-
-  // rendering a backing store requires a node be laid out
-  [self __layout];
-
-  CALayer *layer = [self isLayerBacked] ? self.layer : self.view.layer;
-
-  if (layer.contents) {
-    return;
-  }
-
-  [layer setNeedsDisplay];
-  [layer displayIfNeeded];
-}
-
-- (void)recursivelyDisplay
-{
-  for (ASDisplayNode *node in self.subnodes) {
-    [node recursivelyDisplay];
-  }
-
-  [self display];
-}
-
 - (void)displayImmediately
 {
   ASDisplayNodeAssertMainThread();