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 If we move this logic in the formula to a script and tarball the script with the jar, then wouldn't we still need to have logic in the formula that says 'ungzip, put the script in /usr/local/bin/helios and put the jar in some other dir?

Am I missing something. I feel like either way, there's no escaping some logic in here.