issue #2336, Add a sample project with all plugins.
issue #2336, Remove the unused sample projects in plugin.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop
issue #2336, Modify the compiler of plugins project on ios.
Merge pull request #3027 from natural-law/develop

Adjust the sample projects in plugin
Merge remote-tracking branch 'cocos2d/develop' into js_mac