Modify user show to display active & inactive sponsors separately; implement Sponsor scopes; OSRA-257
Failing scenario for display of actively sponsored orphans only; OSRA-257
Implement Sponsor#currently_sponsored_orphans; OSRA-257
Define User#active_sponsors & #inactive_sponsors; refactor show view to use new methods; OSRA-257
Add number of assigned active sponsors to User index view; OSRA-257