code: function parseUnits(response) {
    let entities = {};
    Object.keys(response).forEach(key => {
      entities[key] = parseUnit(response[key]);
    });
    return entities;
  }
docs: Parse a collection of units.
  @param {Object} response - The collection, containing units as described
  in parseUnit().
  @returns {Object} The parsed collection, containing units as described
  in parseUnit().