Attendee limit, reservations

[pitaj]

If event has a max number of attendees, N,

• If less than N people have signed up, it shows three buttons: [ + Reservation ] [ Remind me ] [ No ]
• After N people reserve a spot, the reservation button changes to: [ + Waiting List ]

Users who respond with "Remind me" receive every notification, unlike with "Maybe" from the normal responses. Users in the waiting list get automatically dropped into the reservation list when someone with a reservation changes their response. They receive a notification when this happens.

Implementation:

• [ ] Changing buttons if event is limited
• [ ] Reservation / Waiting list
• [ ] Remind me treated as "Yes"
• [ ] Notification when dropped into reservation list