CHANGELOG
  =========
  
  2.5.0
  -----
  
   * added Debug\TraceableEventDispatcher (originally in HttpKernel)
   * changed Debug\TraceableEventDispatcherInterface to extend EventDispatcherInterface
   * added RegisterListenersPass (originally in HttpKernel)
  
  2.1.0
  -----
  
   * added TraceableEventDispatcherInterface
   * added ContainerAwareEventDispatcher
   * added a reference to the EventDispatcher on the Event
   * added a reference to the Event name on the event
   * added fluid interface to the dispatch() method which now returns the Event
     object
   * added GenericEvent event class
   * added the possibility for subscribers to subscribe several times for the
     same event
   * added ImmutableEventDispatcher