Use the Puma webserver

[jasondcater]

We need to use the Puma web server in place of Phusion Passenger. We will also need to write a systemd service to support this item. Presently Phusion Passenger will auto load with Apache. Puma will not do this. We will have to reintroduce ProxyPass to Apache.

http://puma.io/
https://stackoverflow.com/questions/29722876/run-puma-server-as-a-service-at-centos-7-no-ruby-found
https://stackoverflow.com/questions/38302492/how-to-get-systemd-to-restart-rails-app-with-puma/38330456#38330456

[graft]

This should probably be on mountetna/cbc-chef, but working anyway.