Add travis file

To have continous integration with jenkins, we use Travis service.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
travis: fix puppet version variable

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
travis: copy travis file from sbadia

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge pull request #375 from enovance/travis

Add travis file