Delete a definition for a long-removed model association.
Implement the new :inverse_of property of model associations to work with Rails 3.2.9+.
Fix an imprecise test checking that Bounty.complete_by is not in the past.
Simplify the Bounty.complete_by validator.
Downgrade to Rails 3.2.8 until we find a way to get has_many :through associations working again.