7 * added Debug\TraceableEventDispatcher (originally in HttpKernel)
8 * changed Debug\TraceableEventDispatcherInterface to extend EventDispatcherInterface
9 * added RegisterListenersPass (originally in HttpKernel)
14 * added TraceableEventDispatcherInterface
15 * added ContainerAwareEventDispatcher
16 * added a reference to the EventDispatcher on the Event
17 * added a reference to the Event name on the event
18 * added fluid interface to the dispatch() method which now returns the Event
20 * added GenericEvent event class
21 * added the possibility for subscribers to subscribe several times for the
23 * added ImmutableEventDispatcher