In ReaderNodeAjaxController, switch $event and $event_name parameters being...
requested to merge issue/epub_reader_framework-3406027:3406027_container_aware_event_dispatcher_dispatch_signature_change into 2.x
In ReaderNodeAjaxController, switch $event and $event_name parameters being passed to ContainerAwareEventDispatcher::dispatch() so that $event is passed in the first position.