2.3.1

- Added ability to clone a metric
- Alert history count is now shown on the alerts page
- Alerts are shown on the dashboard (as a Growl type alert) when they
are triggered
- Alerts are checked periodically (currently every minute) in a
background xsjob even when the dashboard is not being displayed
Merge branch 'master' of https://github.com/paschmann/metric2

Conflicts:
	index.html