[fix #59] remove unnecessary RB_GET_CLASS() calling in where calling rb_class_wrap_new()
[fix #59] remove unnecessary RB_GET_CLASS() calling in where calling rb_class_wrap_new()

casper91/motion-game,HipByte/motion-game,HipByte/motion-game,HipByte/motion-game,casper91/motion-game,HipByte/motion-game,casper91/motion-game,casper91/motion-game