Unit testing

If you want to run the unit tests for mass go to your mass directory and do python runtests.py or equivalently, make test.

If you want to add tests to mass, use the unittest framework, and put the tests in a file somewhere inside mass/src/mass with a name like test_myfeature.py, it must match the pattern test_*.py to be found by runtests.py.

On each commit to develop, runtests.py will be run on semaphoreci.com.