always get mime type from generated thumbnail, not from the original
fixing unit tests
first pass at moving to protocol for creating an image response
i don't know why but this fixes unit tests /cc @drsnyder ?
renaming LocalImageResponseProtocol to StoredObjectProtocol
renamed ObjectStorageProtocol to StorageSystemProtocol
moving transfer! to StoredObject protocols
fixing unit tests after transfer! changes
change names to match new protocol
fixing unit tests
Merge remote-tracking branch 'origin/master' into mime-types

Conflicts:
	dev/user.clj
remove unused import
removing deleted require
moving image-file->response-object multimethod to the StoredObjectProtocol ->response-object function
Merge pull request #23 from Wikia/mime-types

Mime types