Change tag names to be more intuitive
Install vnstat for network traffic monitoring
Base cjdroute.conf selection on inventory_hostname
Auto-detect the cjdns port for iptables

The tradeoff to specifying the variable manually is that it will not be
detected on the initial playbook run. This is due to the purposeful
separation of the common and cjdns roles, so I did not put a handler
into place to trigger a refresh once the port was known.