Expect the correct response content-type now that CouchDB does contact negotiation.
Expect the correct response content-type now that CouchDB does contact negotiation.

ssaavedra/couchdb-python,erikdejonge/rabshakeh-couchdb-python-progress-attachments,oliora/couchdb-python,gcarranza/couchdb-python,hdmessaging/couchbase-mapping-python,jur9526/couchdb-python