cocos2d/cocos2d-x — pull request #5998 by bmanGH (2014-03-26 08:54:43+00:00)
Title: fix crash when sort children while label type is STRING_TEXTURE

If I call Label::sortAllChildren on a Label object manually, it will crash.
I found the reason is:
If Label is STRING_TEXTURE label type, a Sprite will add by Node::AddChild in Label::createSpriteWithFontDefinition function , so this Sprite will add without batch mode (_atlasIndex = INDEX_NOT_INITIALIZED)

test code:
--------------------
```c++
auto label = Label::create("test", "Marker Felt", 24);
this->addChild(label);
label->sortAllChildren();
```