#418 loadScene() and rootNode

[Jean-Louis Boudrand]

When we load a scene with a rootNode different of the sceneManager RootSceneNode, the scene isn't visible with some .irr file (don't work with CopperCube-Irredit 4 irr files)

More details here :
http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=48689