Freeze version number on 0.4.0 tag.
Freeze version number on 0.4.0 tag.

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