Add tksupport

This PR attempt to add some basic tests to run with test-kitchen. Test kitchen is added as a dependency and is saved in the gemfile.lock. 

The test kitchen file is set-up according to the specs in the present vagrant file. It only tests on Ubuntu 1204 for now.

The tests are written in serverspec and include:
-Is the pre-req screen package installed
-Is the nexpose directory present
-Is the nexpose service started

Let me know how this looks. I'm not 100% satified with the directory layout of the test file, but I'll leave that to @rhass-r7 to review.