Updated version

Coded setup.py to prefer setup.utils and fallback to distutils and
added requires= parameter so dependencies where reliably found.
Initial support for python3
Require a version of hostlists that supports python3
Add a github CONTRIBUTING.md file

Update the hostlists dependency
Require setuptools
Update the version
Update the version

Make python2.x work again
Update the version

Add tox configuration
Merge pull request #3 from dwighthubbard/python3

Python3 support
Update the classifier info
Merge pull request #6 from dwighthubbard/master

Add python3 support