Decide upon a system / integration test strategy that runs on Travis CI

[oubiwann]

Blocks #43

[oubiwann]

Added a new repo to explore this here:

• https://github.com/clojusc/mesomatic-testing

[oubiwann]

In a new branch, I've just run the tests on Travis CI with a docker container running Mesos (with Mesomatic installed, too). Nothing set up for testing against it yet, but the basics are in place.