Refactor the framework of plugin on iOS.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Add plugin weibo & demo code in HelloSocial.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Remove the unused code in weibo.
Request developer input the app key of weibo account in demo code.
fixed #2155 : Resolve the bug of callback methods in plugin.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-x
Merge pull request #2568 from natural-law/master

New plugin weibo & resolve bug in plugin