small API changes

::create()
and const chars
Merge remote-tracking branch 'ricorigin/developNewLabel_create' into developNewLabelMerge

Conflicts:
	cocos2dx/label_nodes/CCFontDefinition.cpp
	cocos2dx/label_nodes/CCFontDefinition.h
	cocos2dx/label_nodes/CCStringTTF.cpp
	cocos2dx/label_nodes/CCStringTTF.h
	samples/Cpp/TestCpp/Classes/LabelTest/LabelTest.cpp