closed #4337:label support create by font name,compatible with old labelTTF.
fixed inappropriate usage of inline.
typo fix and coding style improvements.
fix incorrect implementation of Label::getContentSize
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop
Merge pull request #5657 from Dhilan007/develop_label

closed #4337:label support create by font name,compatible with old labelTTF