"Are hours available?" Feature

*Context: Several of the existing food resources do not have available hours. Given this limitation, I have added front- and back-end support for food resources that do not have available hours information.*

+ Added `are_hours_available` boolean to `FoodResource` model.
+ Added additional ‘Are Hours Available?’ drop-down to admin and guest “Add New / Edit Resource” pages
+ Random: Added line breaks to conform with 80-character line limit.
+ Random: Added comments in various places to increase code readability.