Hypothesis Test-framework and Pipenv playground

Install instructions:

1. Install Pipenv:
   1. curl https://raw.githubusercontent.com/mitsuhiko/pipsi/master/get-pipsi.py | python
   2. pipsi install pew
   3. pipsi install pipenv
2. cd into repo folder.
3. pipenv --three or pipenv --python <your python3 flavor>
4. Choose between (may be mutually exclusive, depending on dependencies):
   1. pipenv install for using library (currently not necessary due to zero dependencies).
   2. pipenv install --dev for developing.

Testing instructions:

1. Follow "Install instructions" and step 4.ii.
2. In root of repo folder; pipenv shell
3. python -m pytest tests/ --hypothesis-show-statistics

Development instructions:

Remember to commit any changes to Pipfile or Pipfile.lock to git.

If you want to install a new library dependency:

pipenv install <pypi package or something>

If you want to install a new dev-dependency:

pipenv install --dev <pypi package or something>