Change controller, routes & views; remove composite index from sponsorships
Re-sponsoring previously sponsored orphan works
Create validation for duplicate active sponsorships
Switch to put for inactivate route; update sponsor view to show end dates of sponsorships
Switch to admin/sponsors/:sponsor_id/sponsorships?orphan_id=:orphan_id
Replace controller action with member_action :inactivate, adjust links, remove unneeded routes
Add routing specs for sponsorships
Run migrations after rebase & some refactoring
Change sponsorship uniqueness validation & spec
Replace sponsor methods with sponsorship scopes
Code review: rename sponsorship scopes, improve sponsorship.feature
Merge pull request #57 from NikitaAvvakumov/inactivate_sponsorship

Inactivate sponsorship