Small refactoring of SnapshotStrategy
Small refactorings and a bugfix

(Do not save snapshot when version is 0 and/or snapshot is null)
Corrected title in RavenPersistence nuspec file
Get rid of ISendCommands and IPublishEvents, replace them with IDistributeEvents
The Jitney base class is no longer disposable but QueuedJitney remains disposable
Added another unit test assertion to previous bugfix