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	following changes
   - introduced notion of event bus with publish, subscribe, unsubscribe
     semantics
   - a plug-in can implement the EventBus abstraction to provide event
     bug to CloudStack
   - A rabbitMQ based plug-in that can interact with AMQP servers to
     provide message broker based event-bug
   - stream lines, action events, usage events, alerts publishing in to
     convineance classed which are also used to publish corresponding
     event on to event bus
   - introduced notion of state change event. On a state change, in the
     state machine corrsponding to the resource, a state change event is
     published on the event bug
   - associated a state machined with Snapshot and Network objects
   - Virtual Machine, Volume, Snaphost, Network object state changes wil
     result in a state change event