CDI extension needed by CDI Utils MVP-pattern. See https://github.com/tomivirkki/cdiutils/branches/vaadin and https://github.com/tomivirkki/cdiutils-addressbook/branches/vaadin7.
It hooks into CDI lifecycle listener afterBeanDiscovery. Goes through every AbstractPresenter Bean and adds an ObserverMethod which provides
1) transport for some own ParameterDTO as event object
2) making a qualifying filter from CDIEventImpl. CDIEventImpl is a public static class which extends AnnotationLiteral<CDIEvent>. CDIEvent is a "Qualifier for view events observed by presenters." CDIEventImpl implements "Qualifier with member" value(), whose String is set  to the value of the @ViewInterface on the Presenter Bean.
3) And that exakt "Qualifier with member" resides e.g. protected void newSearch(
            @Observes @CDIEvent(NEW_SEARCH) final ParameterDTO parameters) {
        view.setView(SearchView.class, true);
    }
4) on notifyed with the ParameterDTO calling each targeted AbstractPresenter with viewOpened().