Merge pull request #61 from sajinidesilva/slots_Imp

changed a name of server configuration
Fix foreign key violation when adding meta data for a new queue.
Merge pull request #62 from akalankapagoda/foreignKeyFix

Fix foreign key violation when adding meta data for a new queue.
introducing store level modifications, store strategy and removed Global queue manager and worker.
Merge pull request #63 from abeykoon/introduce_strategy_for_messageStore

introducing store level modifications, store strategy and removed Global...
slot impl - bug fixed and refactored