add some png.
Merge branch 'master' of https://github.com/yuye-liu/CocostudioIronCity

Conflicts:
	cocos2d-html5_i/IronCity/src/other/AudioPlayer.js
	cocos2d-html5_i/IronCity/src/resource.js
	cocos2d-html5_i/IronCity/src/scene/MainMenuScene.js
Merge pull request #2 from shujunqiao/master

modify cocos2d.js