了解场景转换时，使用的几个函数（ onEnter , onExit ,等一些方法）的先后顺序调用——（日志记录）
2013-03-20 21:30:18.520 LikScenesAndLayers[4220:207] ======================================
2013-03-20 21:30:18.520 LikScenesAndLayers[4220:207] scene: OtherScene
2013-03-20 21:30:18.521 LikScenesAndLayers[4220:207] init: <OtherScene = 0x631d890 | Tag = -1>
2013-03-20 21:30:18.981 LikScenesAndLayers[4220:207] onEnter: <OtherScene = 0x631d890 | Tag = -1>
2013-03-20 21:30:22.032 LikScenesAndLayers[4220:207] onExit: <FirstScene = 0x6337880 | Tag = -1>
2013-03-20 21:30:22.032 LikScenesAndLayers[4220:207] onEnterTransitionDidFinish: <OtherScene = 0x631d890 | Tag = -1>
2013-03-20 21:30:22.033 LikScenesAndLayers[4220:207] dealloc: <FirstScene = 0x6337880 | Tag = -1>
