碰撞检测道具拾取 collider.zip

creator碰撞检测的实现和道具拾取功能；碰撞检测系统；三个接口: onCollisionEnter: function (other, self) // 开始 onCollisionStay: function (other, self) // 持续 onCollisionExit: function (other, self) // 结束