code: function(doc, callback) {
          audit([doc], function(err) {
            if (err) {
              return callback(err);
            }
            docsDb.saveDoc(doc, callback);
          });
        }
docs: Saves the given doc with an audit record
  
  @name saveDoc(doc, callback)
  @param {Object} doc
  @param {Function} callback(err,response)
  @api public