code: function removeUpdatesInRequest(updatesInDb, updatesInRequest) {
    var updatesNotInRequest = _.filter(updatesInDb, function(dbUpdate) {
      var foundInRequest = _.findWhere(updatesInRequest, {hash: dbUpdate.hash});
      return !foundInRequest;
    });
    return updatesNotInRequest;
  }
docs: Remove all the records in `updatesInRequest` from `updatesInDb` if they exist
  @param {Array} updatesInDb
  @param {Array} updatesInRequest
  @returns