++++++++++++++++++
* Update docs.
* Change Travis CI coverage to officially supported combinations of Django and Python. https://docs.djangoproject.com/en/1.11/faq/install/what-python-version-can-i-use-with-django
* Add class method ‘get_or_create’ to Health model to address bug when upgrading to Django 1.11.2. (2)
* Add Travis CI coverage for Django 1.11.
* Update docs.
* Add CI coverage for Python 3.6.
* Refactor HealthTestView ‘get’ method to reduce number of function calls.