Send a message when filtering a changes row
Send a message when filtering a changes row

We managed to miss this change during the great merge as it was a
confusing mess in the cloudant/fabric repository. Its obvious in
hindsight once you see that we have a
`fabric_view_changes:handle_message/3` clause to handle the message.

COUCHDB-3178

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb