code: function(doc, callback) {
          audit([doc], 'delete', function(err) {
            if (err) {
              return callback(err);
            }
            docsDb.removeDoc(doc._id, doc._rev, callback);
          });
        }
docs: Deletes the given doc with auditing
  
  @name removeDoc(doc, callback)
  @param {Object} doc
  @param {Function} callback(err,response)
  @api public