This fixes scilifelab pull request

Please @tzcoolman, run the tests (make tests) before going for a pull request. Let me know if you have problems running the tests.

The build was broken bc `prob.c` was not included in `setup.py`:

https://travis-ci.org/SciLifeLab/facs/builds/5405849

I just added a more general globbing in setup.py, that should not happen again. Merge in this pull request, aimed to your own branch as you can see, and I will merge yours upstream if it passes.

Cheers!
Roman