Old Changelog file removed from unstable branch.
Added a release notes file good for "unstable".
Cluster: added signature + version in bus packets.
Cluster: discard bus messages with version != 0.
Cluster: signature changed to "RCmb" (Redis Cluster message bus).

Sounds better after all.
Cluster: don't propagate PUBLISH two times.

PUBLISH both published messages via Cluster bus and replication when
cluster was enabled, resulting in duplicated message in the slave.