Add some tests

[agx]

This series a.dds the infrastructure to run tests via

python setup.py nosetests

or tox. This will ease adding python3 support and more features.

[agx]

I've made the code adhere to pep8 as well.

Any objections to include this project in travis CI or alternatively run the tests in foreman ci so we don't regress?

Once this is in we can easily add python3 support without breaking things in one or the other python version all the time.

[agx]

Ping?

[dLobatog]

Thanks @agx !