code: function listPendingChangesForClient(datasetId, clientInfo, cb) {
    pendingQueue.search({datasetId: datasetId, cuid: clientInfo.cuid}, cb);
  }
docs: List the pending changes for the given client that are still waiting to be processed
  @param {String} datasetId
  @param {Object} clientInfo the client info. Should contain the cuid
  @param {Function} cb