[refs #56] Adding ALLOWED_HOSTS setting for butler
[refs #56] hiera_array did not behave quite as expected
[refs #56] Tedious puppet templating language strikes again
[refs #54] Reconfiguring to have statsd on all machines
[refs #54] Removing distribute installation as it breaks (uninstall then reinstall requires distribute...)
[refs #54] Actually including statsd on all machines this time!
[refs #54] Statsd now only listens on localhost
[refs #54] Removing statsd from monitoring role
[refs #58] Purging the masterinfo resource
[refs #58] Reinstated the master info export
[refs akvo/butler#2] Fixing system stats to send 0 if there are no udpates
[refs akvo/butler#2] Fixing the path used by system stat jobs, as under cron, PATH is not set