Grafana 3.1.0 release tag

Grafana 3.1.0-beta1 release tag

3.0.4 release

3.0.3 release

3.0.2 release

3.0.1 release

3.0.0-beta7 release

3.0.0-beta6 release

docs(): updated download links

Grafana 3.0-beta4 release tag