DelayedWriteRavenEventStore now sets DocumentSession.Advanced.UseOptimisticConcurrency = true.
Now properly reports exception when conflicts are found by the Concurrency Monitor.
Modified so that failedmessageevent handlers are required, unless bubbling is specified by the EventPublishingExceptionFilter.
Impl'd LightweightCacheForRuntimeKey.
Impl'd LightweightCacheForRuntimeKey fully.
Removed LightweightCache* fixed broken tests.