Deleted Interest scaffold in order to make polymorphic version from scratch
Added polymorphic Interest scaffold
Added Interests table, moving forward with polymorphism
Added false defaults to polymorphic Interests via migration
Added has_one polymorphic relationship to {Volunteer, Event, Subgroup, Nonprofit} => Interest
Added polymorphic Interest routes and modified actions for controller
Added validations to Interest-based relationships
Ehh, I removed the presence validation b/c screw nested forms; also put dependency destruction in place
Added Nonprofit <1 - *> Events relationship
YOLO
Merge branch 'master' of https://github.com/LOZORD/moov

I.e. George's code