ENH/API: Checking in patch from Erik Tollerud which adds a `move`, `yaw` and `pitch` to the mlab camera.  Many thanks to Erik for this patch.
ENH/API: Checking in patch from Erik Tollerud which adds a `move`, `yaw`
and `pitch` to the mlab camera.  Many thanks to Erik for this patch.


alexandreleroux/mayavi,liulion/mayavi,dmsurti/mayavi,alexandreleroux/mayavi,liulion/mayavi,dmsurti/mayavi