code: function (lastUpdated, criteria) {
              assert.isDate(lastUpdated);
  
              return this.find(_.merge({}, criteria, byLastUpdated(lastUpdated)));
          }
docs: Extend a criteria object with additional waterline query paramters to
  find all records that have been modified after the provided date.
  Returns the waterline (bluebird) promise from the find method with the
  extended criteria.
  
  @param {Date} lastUpdated
  @param {Object} criteria
  @returns {Deferred}