Steps to publish to PyPI:

1) run `make test`
2) update version in setup.py
3) Tag the current release in git to match the version in setup.py
    git tag -a 1.2.0 -m 'Release 1.2.0'
4) commit any pending changes to git
    git add .
    git commit -m 'commit changes'
    git push origin 1.2.0
5) test publish
    ./publish.sh test
6) publish to PyPI
    ./publish.sh pypi