Move fetching of atts from atts_to_mp into doc_to_multipart_stream
Move fetching of atts from atts_to_mp into doc_to_multipart_stream

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,apache/couchdb-couch,fkaempfer/couchdb,fkaempfer/couchdb,cloudant/couchdb-couch,cloudant/couchdb-couch,apache/couchdb-couch,apache/couchdb-couch,cloudant/couchdb-couch