Refactor CCSpriteFrameCache
Merge pull request #1375 from pandamicro/develop

Fixed #3461: LabelTTF with zero dimension breaks line with hard line break
Update CCSpriteFrame.js
Update CCSpriteFrame.js
Merge pull request #1376 from WanderWang/CCSpriteFrameOptimize

Optimize CCSpriteFrame's init performance
Refactor #3370: Avoid overwrite user’s custom body style
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into develop