Add README.md & travis.yml for github

Squashed commit of the following:

commit 96f92da1daf88ffb5ff159db5050cdb33976e3b3
Author: Peter Hille (png!das-system) <peter@das-system-networks.de>
Date:   Sat May 4 22:11:25 2013 +0200

    Add .travis.yml file for Travis CI.

commit 1bc92909b9c99b464e5df45b0c0f82eb306e00ee
Author: Peter Hille (png!das-system) <peter@das-system-networks.de>
Date:   Sat May 4 22:11:13 2013 +0200

    Add README.md file for github.

Signed-off-by: Peter Hille (png!das-system) <peter@das-system-networks.de>