added jsb support for AssetsMAnager
purgeStoragePath added
key with hash to support multiple assetsManager
DelegateProtocol is weak-referenced again
applied cocos2d-x coding style
style edited
* obey naming convention
* hide unnecessary methods from public.
men leak fixed (life-cycle management was hand downed to scene-graph)
merged
Update AppDelegate.cpp
Merge pull request #3548 from nakosung/multi_assets

exposed AssetsManager to javascript and added multiple-assetsManager support