issue #4629: add test case for group command
issue #4629: test case add a spriteInGroup instead of sprite, the sprite can not be seen now
closed #4629: fix bug for group command
closed #4629: remove unused _renderStack
Incompatible pointer type?

Why sizeof(void**) and not sizeof(void*)?
Merge pull request #6195 from iSevenDays/patch-3

Incompatible pointer type fix in cpArrayNew
Some fixes detected by xcode analyze
Merge pull request #6198 from dumganhar/xcode-analyze-fix

Some fixes detected by xcode analyze
Merge pull request #6166 from dabingnn/develop_fix_rendererBug

Develop fix renderer bug
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop