Hooked up attending, not attending buttons. The choice that has been made will be gree. 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.
make local var name follow convention
Added a function to format the date properly in GroupLogistics (the shortened date should prevent misalignment of headers and info, but we should test this to ensure that it is robust)
Refactor as Kevin requested.
Merge pull request #17 from Transformapp/group_logistics

Group logistics