Travis-ci for continuous integration

Hi, Vinzenz Feenstra today showed me how easy it is to integrate travis continous integration building with github repositories and pointed out that it is free for floss projects. Since we are a floss project and have already mirrors in github, I would propose that we create .travis.yml files so some of our continuous integration tests and builds run (without spending any of our resources) in travis. The big advantage for vdsm, for example, is that the travis containers run debian and it would be very nice to have it set up so it alerts us if we break the debian/ubuntu builds.