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Cocos2d-JS 3.1 beta update
"Cocos2d-JS Single File Engine User Guide" Korean version
"Cocos2d-JS v3.1 beta release note" Korean Version
"Cocos2d-JS v3.1 beta changelog" Korean Version
Merge pull request #568 from sincntx/master

[Cocos2d-JS] Add Facebook Test Case & v3.1 beta Korean Version