Add tox test-runner, and very basic tests

This test suite exists so that we can verify the success of a pull request
submitted to this package that supposedly gives us Python 3.x support.

We would do better to have a more serious test suite, but this is
noticeably better than nothing, as it also provides a tox.ini which
will enable us to run the test suite on multiple versions of Python
easily.
I tried py34 and the tests don't pass against that yet.

When we merge #1 we should add py34 (and perhaps py33, if it passes) to this.

Also arguably we should then have Travis-CI run our tests on very pull request etc.

Note that I excluded the 3.x Python stuff from this list because I only wanted to be adding tests tha tpassed at the moment.