Add option to disable normals in MeshLod sample.
Add option to disable normals in MeshLod sample.

--HG--
branch : ogre-gsoc2013-progressive-mesh-improvements

jhu-lcsr-forks/ogre,jhu-lcsr-forks/ogre,jhu-lcsr-forks/ogre,jhu-lcsr-forks/ogre,jhu-lcsr-forks/ogre