add create invite use case
track new files
change accept invite use case to respond to invite use case
set default topic for group, create new group betw inviter/invitee if no group id on invite, otherwise adds user to the existing group
remove create group spec and create group use case
add vcr gem, experimenting with entities for interest and profile
add geocoder and vcr gems, working on use cases for create invite, create user
add use case for find user, entity for locations, rename spec/use_case to spec/use_cases