Remove tests harness

I'm not using tests here, so rather than keep useless tests cluttering
the project I decided to remove them.

This causes the `mvn package` task to fail, so I added a skip test
configuration on the Maven Surefire plugin as described by smp7d
(https://stackoverflow.com/users/395975/smp7d) on Stack Overflow:
https://stackoverflow.com/questions/7456006/maven-package-install-without-test-skip-tests/7502723#7502723

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