scanner module

[jknack]

{
   use(new Scanner());
}

It scans mvc routes, jooby modules and applications under the application-package. Optionally, can scan and register singleton services annotated with something, implementing something or extending something:

{
   use(new Scanner()
        .scan(Service.class)
        .scan(MyService.class)
        .scan(Named.class)
        .scan(Singleton.class)
        );
}

See #422 /cc @wenerme