Way to test if rsvp'd on swipe

[AbhiAgarwal]

There needs to be a way to check if a person has RSVP'd when they swipe they card. They should not automatically be checked in.

The big case we need to cover is: when an event has a lot of RSVPs we need to make sure we are checking people in who have RSVP'd.

1. If a user swipes then it should notify the person checking in if they have NOT rsvp'd. In this case they can then override and check them in if they event is not full.
2. If a new user is being created to check someone into an event then the person checking in should be notified that this person has not RSVP'd.

The override always needs to be there in some form. This is important since in the majority of the cases we want to be able to check anyone in (regardless of their RSVP status).

In the future we can also determine the full-ness of an event by looking at the venue seating size and the RSVP count.