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

--HG--
branch : 0.4.x
extra : convert_revision : svn%3A7a298fb0-333a-0410-83e7-658617cd9cf3/branches/0.4.x%4081

infinit/couchdb-python,djc/couchdb-python,Roger/couchdb-python,djc/couchdb-python