Missing switch to ConcurrentCache

Removed newer Magnum reference

Release version 2.6.3

Added capture of transactional state of receive so we don't duplicate…

… error queue messages

Adjusting timing for distributor

Added cancel to handlers on timeout

Tuned some startup, added RabbitMQ heartbeat

Updating prerelease version for prerelease

Updated version for master

Upgraded NHibernate to 3.2