Better error handling when can't unprotect the data
Store the replication hilo as an identity value, not as a document.
Saves us from concurrency control on this value.
Merge branch 'RavenDB-2570' of https://github.com/grisha-kotler/ravendb
Better backward compatibility with the way we were storing the version hilo
Merge branch 'master' of https://github.com/ayende/ravendb into RavenDB-2570