Add a newrelic role

[patcon]

Would be great if newrelic were just included in the setup

https://github.com/escapestudios/chef-newrelic
https://github.com/heavywater/chef-newrelic
https://github.com/8thBridge/chef-newrelic-monitoring
https://github.com/skystack/chef-newrelic
https://github.com/phlipper/chef-newrelic-sysmond

[patcon]

https://github.com/phlipper/chef-newrelic-sysmond seems best for system monitoring. No clear winner for php apps yet