Fix for issue #167. Need to sort the children in the layer before rendering them to preserve their Zorder.
rename isolateChildren to what it really is - clipChildren.
Issue #167: switched out to use an enum in preparation for a rendertarget specific rendering of CCLayer.
Fix for transitioning a scissor rect that ends up outside of the viewport during the transition. This change will attempt to truncate the scissor rect to properly fit into the transition scene.
Take out hack for Font drawing with Mac as it has been fixed in MG