Create rotating cube with directional lighting

  * Directional lighting found at: http://threejs.org/docs/#Reference/Lights/DirectionalLight
  * Basic scene and cube creation found at: http://threejs.org/docs/index.html#Manual/Introduction/Creating_a_scene
  * Frustum is: http://en.wikipedia.org/wiki/Frustum
  * Mesh material basic does not work for lighting