Travis-ci for continuous integration

[Antoni Segura Puimedon]

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.