Adding init script for deploynaut PHP resque

Assumes a Debian based Linux environment, I don't think deploynaut is supported on any other systems yet, anyway.

A few variables are hardcoded: `www-data` for the worker user, as well as the site root `/sites/deploynaut/www` and the amount of workers: `4`.

This script could be referenced in the installation docs and customised manually by whoever is setting up deploynaut on their system.