code: function getDomain(domain, callback) {
      getAll(function onGetAll(err, domains) {
        if (err) {
          return callback(err);
        }
  
        callback(null, domains.results.filter(function onGetDomain(domain_obj) {
          return domain_obj.domain == domain;
        })[0]);
      });
    }
docs: Get a domain by it's name.