Moving to a transaction merger mode based on blocking collection.
Hopefully this will resolve the dead lock in this scenario
Making sure that we support reading from WriteBatch
Merge branch 'voron' of https://github.com/ayende/raven.voron into voron
Fix type
Merge commit '71006f0b7e6200d03ad3b7659aec140596fe7ff6' into New3

Conflicts:
	Raven.Voron/Voron/Impl/TransactionMergingWriter.cs
	Raven.Voron/Voron/ValueReader.cs