Create automated testing

[DanielJDufour]

Is your feature request related to a problem? Please describe.

We need to set up automated testing, so we can automatically test pull requests

Describe the solution you'd like

We probably should create a .circleci folder and create a config.yml inside of this folder. This config.yml configures the Circle CI tests. Here's an example of a config.yml file: https://github.com/FirstDraftGIS/cooccurrences/blob/master/.circleci/config.yml

Describe alternatives you've considered

TravisCI also provides from testing for Open Source projects. I'd be happy with Travis CI, too! :-) Here's an example of a .travis.yml file: https://github.com/DanielJDufour/date-extractor/blob/master/.travis.yml

Additional context

N/A

[DanielJDufour]

Argh. I noticed we already have Travis CI tests running