Updated docs for ServiceMatrix V2.2.0
Added DisconnectWorkersFromARunningDistributor.md
"How a distributor work?" with diagrams
What happens when a worker goes down? modified
Bigger font in diagrams
Smaller subtitles
link with # changed to direct link instead of pointing to md
header formatting
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
Fixed invalid config section
remove use of obsolete method
Update NServiceBus-Step-by-Step-Guide.md
Update NServiceBus-Step-by-Step-Guide-fault-tolerance-code-first.md
Update nservicebus-step-by-step-publish-subscribe-communication-code-first.md
minor cleanup in host doco
Merge pull request #454 from dprothero/servicematrixV2.2.0

ServiceMatrix V2.2.0 updates for issue #427