Add post_install script in setup.py.
Add post_install script in setup.py.


Former-commit-id: 9b67a3dba34daa0fa6af017433ad0ea3d7b4dac3
openworm/PyOpenWorm,gsarma/PyOpenWorm,openworm/PyOpenWorm,hnunner/PyOpenWorm,travs/PyOpenWorm,gsarma/PyOpenWorm,kaustubhcs/PyOpenWorm