Make py2k/py3k independent, add setup.py

[mcepl]

I have to work on RHEL-7 where we still have only python 2.7. Given that this doesn't break py3k compatibility, I think it should be painless to add this modification to py2k.

Also, setup.py is a good thing to have, so that the script can be finally installed.

[mcepl]

I don’t what’s the versioning policy on the script, so I left it with 0.0.0.