Coverage with Travis and Coveralls

I took what @lslezak had in yast-registration end extended the yast stubs a bit. The results are
- https://travis-ci.org/mvidner/yast-cio
- https://coveralls.io/r/mvidner/yast-cio

(currently set up against my fork, but once this is merged I will delete that and replace it with the yast/yast-cio repo)