Display an Error message if SLR is disabled or a Warning if SLR is enabled, yes I am aware that this is a big HACK! Related to #860
HandleCurrentMessageLater needs to send message back to distributor if endpoint is a worker, closes #851
Attempt to make the creation of the NSB performance counters more resilient to errors from previous weird states.
Merge branch 'develop' of github.com:NServiceBus/NServiceBus into GatewayActiveMQ