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Now that the app is getting more use and bugs are popping up outside of what unit tests will easily catch, it's time to add some end to end tests (full browser automation).
This uses a new Docker Compose configuration of a Selenium Grid Hub and Selenium Grid Nodes (Firefox because that's built-in) along with the existing Docker Compose containers and lab test framework to run tests locally.
I also updated some of the documentation and steps to get up and running. In order for these to run on Travis, we'll need to modify the setup so it's automated. This PR is already big enough and is going to create merge conflicts for others so may save that for another more manageable branch.