Add helios package

This package supplies the command line executable jar for
Helios, a Docker container orchestration platform developed
and open-sourced by Spotify.

https://github.com/spotify/helios
@mikemcquaid Hm, I'm not sure it can. The helios CLI makes HTTP requests to read, write, and delete from a zookeeper cluster specified by switches. So it only works if you have a zookeeper cluster installed with the Helios server.

I'm wondering if there's any meaningful test I can write here.