ENH : factor out the montage code to use it for other mayavi figures
ENH : factor out the montage code to use it for other mayavi figures

nipy/PySurfer,effigies/PySurfer,Eric89GXL/PySurfer,haribharadwaj/PySurfer,bpinsard/PySurfer,diego0020/PySurfer,mwaskom/PySurfer