Convert to Python3

[ralic]

using : find . -name '*.py' | xargs 2to3 -w

[petebachant]

Thanks for the PR! I'd like the keep this package compatible with both Python 2 and Python 3, however. Can you first remove the *.bak files? Converting the print and xrange statements are great.

[ralic]

I've tested it and it works for both python2.7 and python3.6

[petebachant]

Looking good. If you bring back the from __future__ imports, it should be ready to merge.