SDKBOX js listener auto release when run heavy scene

Hi @nite:

Let me know when you’ll plan to fix it.

SDKBox Samples are convenient for user reference, but it doesn’t mean it works with a full game with multiple Scenes and Layers.

Samples must be integrated into cocos2d-x/samples to demostrate that they are 100% tested with a showcase (similar a game).

Thanks and best!