changed ParserOptions.effect to ParserOptions.material according to Feature #1108 ParserOptions.defaultEffect should be ParserOptions.defaultMaterial
fix for Bug #1019 bounding box computation does not take firstIndex/numTriangles into account
added an optional "name" parameter for SceneBackground
remove useless (and broken) call to lightLocalToWorldTransformChangedHandler() in LightController.lightRemovedFromScene()