JDBCJournalActor can no longer be initialised with the Journal factory

[jakzal]

I stumbled upon this issue while upgrading from vlingo 1.3.0 to 1.4.0.

Since vlingo/xoom-symbio-jdbc#43, the Journal factory no longer works:

Journal.using(stage, JDBCJournalActor.class, dispatcher, configuration);

The implementation assumes that dispatcher is part of argument list:

static <A extends Actor, T, RS extends State<?>> Journal<T> using(final Stage stage, final Class<A> implementor,
          final Dispatcher<Dispatchable<Entry<T>,RS>> dispatcher, final Object...additional) {
    return additional.length == 0 ?
             stage.actorFor(Journal.class, implementor, dispatcher) :
             stage.actorFor(Journal.class, implementor, dispatcher, additional);
  }

While it is still valid for some implementations (like InMemoryJournalActor) it is no longer the case for JDBCJournalActor.

/cc @pflueras