Updated Build server for Docker 1.3 with TLS

After several [attempts](https://github.com/JWGmeligMeyling/build-server/compare/spotify-docker-client), I haven't been able yet to integrate the existing Docker clients into this repository, because they rely on Jersey instead of Resteasy. Therefore, in this PR I just took the keystore from the [Spotify Docker Client](https://github.com/spotify/docker-client) and configured it for Resteasy. I also updated Resteasy to a newer version. To get things to work on my system, I had to change the way the volumes are mounted. We need to check if this is related to Boot2Docker hosts or the newer Docker versions before deployment.