Prepare unit testing

[dustywind]

As our plug-in grows more and more complex we require automated tests in order to guarantee that everything works. These tests should be integrated with Travis-ci and communicate any error through a failing build.

Following result is expected:

• proposal for a unit-testing framework
• a working example test which covers at least a little bit of our plug-in code

[dustywind]

Our tool of choice is cunit. It is licensed under LGPL and offers basic assertions and failure-statistics. All code concerning testing can be found in the test folder