Python 2 and 3 interoperability

[mcquin]

This line prevents Python 3 use:

#! /usr/bin/env python2

Additionally, the Pythonic way of using urllib.parse in 2 and 3 environments is:

from six.moves.urllib.parse import urlparse

From: Cheat Sheet: Writing Python 2-3 compatible code

[ctrueden]

Thanks @mcquin. Would you care to file a PR?

[mcquin]

Sure. I can do that.