Split Integration and Unit tests

[nicoruti]

See http://zeroturnaround.com/rebellabs/the-correct-way-to-use-integration-tests-in-your-build-process/ for details.

[Cynthion]

Very good idea! I would appreciate if we could introduce separate packages for both unit and integration tests. If we want, we could add a "IT" suffix to integration tests. However, with dedicated packages this should not be necessary.