fix GenericRelation object_id / target id join type mismatch#129

timgraham merged 2 commits intomongodb:mainmongodb/django-mongodb-backend:mainfrom

WaVEV:add-support-for-GenericForeignKey-and-GenericRelationWaVEV/django-mongodb-backend:add-support-for-GenericForeignKey-and-GenericRelationCopy head branch name to clipboard