Event dispatch when the user is already authenticated

Consider this use case: the user signs in you app, s/he's already signed in but email address is not verified yet. It's reasonable to verify user email address the first time a link is clicked inside the registration email.
This PR let AutoLoginListener::handle() function to dispatch an event each time an autologin link is detected and the user is already authenticated, instead of simply returning. Email verification (or other business logic) then will be implemented in the listener/subscriber inside your app.