Cqrs login event, new event agger impl adjtments

* Added code to get the user id for the current user and add this to the
event.
* I believe the login was failing because there was no user id
associated with the ibUserLoggedInMessage event. And indeed, I shouldn't
trust the user id from that. I now am getting the user id via
information stored in the container about the currently authenticated
user.
* Adjusted code to use the new and improved EventAgger implementation.
(Also took out Rx as this was no longer a dependency).