Work in progress on handling user state
I just committed everything. Not sure what will survive yet.
More complete handling of IM events
Expose some debugging facilities in Aquarium class
Fix compilation error due to API change in rabbitmq client lib
Keep LRU from guava libraries
Remove supervisor of user actors
Remove shutdown listener when stopping the rabbitmq consumer
Set rabbitmq heartbeat
Do not recheck stuff that should have been checked elsewhere
Fix requirements for role history item
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