Publish package to PyPI

[monocongo]

Build upon #55 and publish to PyPI, so that users can bypass building/installing from the source code from GitHub. Follow the instructions outlined here. Update the documentation accordingly.

[monocongo]

The package is now installed as version 1.0.2.

Further work to be done:

• make sure the grid processing entry point works as expected
• add the divisions processing as an entry point
• remove the scripts directory and all script files
• update the README and/or documentation files to reflect the above changes
• add information into the documentation files to explain how to install via pip install and run scripts without building/testing, etc.
• update version to 1.0.3 and push to PyPI

[monocongo]

Reminder: do this on Linux, save yourself some headaches.

Short version:

1. Get the setup.py file in shape as described here
2. $ rm -rf dist
3. $ python setup.py sdist bdist_wheel
4. $ twine check dist/*
5. $ twine upload --repository-url https://test.pypi.org/legacy/ dist/*
6. $ twine upload dist/*