Updated docs for ServiceMatrix V2.2.0
Added RavenDB 2.5 installation info.
Merge remote-tracking branch 'primary/master' into servicematrixV2.2.0

Conflicts:
	Content/ServiceMatrix/getting-started-sagasfullduplex-2.0.md
	Content/ServiceMatrix/getting-started-with-nservicebus-using-servicematrix-2.0-publish-subscribe.md
	Content/ServiceMatrix/index.md
	Content/ServiceMatrix/servicematrix-serviceinsight.md
Updated SignalR and RavenDB persistence docs for ServiceMatrix
Added RavenDB doco links from ServiceMatrix. Added RavenDB v2.0 uninstall info. #427 #468
Removing NServiceBus.Persistence.v4 RavenDB v2.0 #468
Merge pull request #454 from dprothero/servicematrixV2.2.0

ServiceMatrix V2.2.0 updates for issue #427