Renderer: CCNodeGrid : Make sure we group our render commands
Renderer: CCNodeGrid : Make sure we group our render commands

* This ensures that the underlying render texture is correctly contained
* Also general clean-up of CCNodeGrid

haithemaraissia/CocosSharp,MSylvia/CocosSharp,mono/CocosSharp,TukekeSoft/CocosSharp,zmaruo/CocosSharp,zmaruo/CocosSharp,MSylvia/CocosSharp,mono/CocosSharp,haithemaraissia/CocosSharp,TukekeSoft/CocosSharp