initial travis-ci support

initial travis-ci support

including refactoring by Steffan Karger, merged into a single commit.

Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1473938808-3312-1-git-send-email-chipitsine@gmail.com>
URL: http://www.mail-archive.com/search?l=mid&q=1473938808-3312-1-git-send-email-chipitsine@gmail.com

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1473938818-3375-1-git-send-email-chipitsine@gmail.com>
URL: http://www.mail-archive.com/search?l=mid&q=1473938818-3375-1-git-send-email-chipitsine@gmail.com

Signed-off-by: Gert Doering <gert@greenie.muc.de>