Do not show view components if not attending (#12).

If user has selected they are not attending, do not
show the components for Attendees or Reservation
Notes views.

- Add a property on base controller to check isAttendingBigDay.
- Show user a message if they have chosen not to come.
During transition, set previous route to current (#12).
Merge branch 'rsvp-client' of https://github.com/borwahs/natalieandrob.com into rsvp-client