Solution for CI Docker build

As this gets in https://github.com/Capgemini/mesos-ui/pull/51

We can not use dockerhub automatic as we have a dependency on the static files used by the mesos container being generated dynamically.

Some solutions might be:
http://docs.travis-ci.com/user/docker/#Building-a-Docker-Image-from-a-Dockerfile
http://www.mikeheijmans.com/docker/2015/09/07/automated-docker-deployment-with-circle/