The systemd administrator may wish to use additional resource control
facilities which systemd provides. Document the existence of these, and
provide some example options in commented form.
The supplied systemd unit file places some basic security restrictions
on the rest service. This patch enhances those, and improves the
overall security assessment score given by `systemd-analyze security`
from "8.3 EXPOSED" to "1.3 OK".
Closes#148
Tim Small