applying Voron part of commit RavenDB-1735. Voron: Implement TramsactionalStorage.GetDatabaseSizeIn (hash 2009e594f58913166d945e3c50ad5cdae8d7f8cb --> RavenDB/New3)
reapplying lost commit (https://github.com/arekais/ravendb/commit/ac4e6eaa9a0587253e40bb87c1eaedfbc2fda5dd)
WIP
log shipping WIP (not finised yet)
WIP -> regular log shipping working
small refactoring
removed tracking for last shipped transaction id
misc refactorings
taking remote changes - conflict resolution