Use Travis CI to run tests on all pull requests
Use Travis CI to run tests on all pull requests

[Travis CI](https://travis-ci.org) is a Continuous Integration tool for running tests which is free for open source projects like this one.  The owner of the this repo would need to go to https://travis-ci.org/profile, login with GitHub ID and flip the repository switch __on__ to enable free automated testing of each pull request.

[Flake8](http://flake8.pycqa.org) tests can help to find Python syntax errors, undefined names, and other code quality issues.
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