WIP: Add followup check

Will resolve #6 when completed. 

For now, implementation is as simple as possible—followup is a date property attached to the application. Will add further complexity if required at a later juncture—same thing for interview follow-up prompts.
It seems there's lots in this file you removed, but I can't tell if you meant to based on the fact that a lot of the removals were additions made earlier today.