GamedayService now knows about the new REST methods
Update the Attendee class
It won't ever receive the date_registered, and it should receive the ID
RegistrationClient now knows about the new GamedayServices
Remove an unused import
Switch Attendee to use camelCase
RegistrationClient should be more obvious that it needs an ID
GamedayService now knows how to look up users by name
RegistrationClient can now look up by first and last name
Dumb mistake in Retrofit - use @Path, not @Query