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

-Add "Cocos2d-JS Single File Engine User Guide" Korean version
-Add "Cocos2d-JS v3.1 beta release note" Korean Version
-Add "Cocos2d-JS v3.1 beta changelog" Korean Version
-Add "Explorer Facebook SDK for Cocos2d-JS" Korean Version
-Update related link