Swift: typed completion in vok_addWithArrayInBackground:completion:

[brockboland]

NSManagedObject+VOKManagedObjectAdditions includes a vok_addWithArrayInBackground:completion: method that calls a completion block with the newly-created or -updated objects.

It would be handy to have a typed version of that in VokoderTypedManagedObject.swift for NSManagedObject subclasses.