Add missing spec from PR for adding inc to Contextual::Memory
Add missing spec from PR for adding inc to Contextual::Memory

jonhyman/mongoid,mongodb/mongoid,herimedia/mongoid,mongodb/mongoid,mongodb/mongoid,Welovroi/mongoid,kay-kim/mongoid,herimedia/mongoid,jonhyman/mongoid,kay-kim/mongoid,Welovroi/mongoid