===>  COMPATIBILITY NOTE:
      CouchDB is still pre-stable; between 0.8 and 0.9 the database format
      changed which breaks BC. In current trunk, the format changed again, so
      please double-check in case you are updating an existing installation.

      More info:
        * http://wiki.apache.org/couchdb/Breaking_changes?action=show&redirect=BreakingChanges
        * http://wiki.apache.org/couchdb/BreakingChangesUpdateTrunkTo0Dot9