AgileVentures/osra — pull request #208 by NikitaAvvakumov (2014-12-10 13:38:10+00:00)
Title: Push develop to staging

## New feature:
- start & end dates for sponsorships

## Under the hood:
- db-level uniqueness constraints on all `osra_num` fields
- explicit specification of title for the sponsor show view
- rake task for deleting all orphan-related data from the db