Group logistics

Hooked up attending, not attending buttons. The choice that has been made will show green text. Attendees row on top will update as user clicks attend or not attend. If no choice has been made yet, both buttons' text will be white.
I think we can refactor this into a class.  Basically taking in a user, determine if this user is the same as the current user.  I would add this in the user class, rather than doing this here functionally.