code: function run (options) {
      if (options.results) {
          return map(options);
      }
  
      return fetch(options).then(map.bind(null, options));
  }
docs: Public function `run`.
  
  Invokes WebPageTest then maps the result data, returns an ES6 promise.
  
  @option uri        {string}  Base URI for the WebPageTest instance, defaults to
  `www.webpagetest.org`.
  @option key        {string}  WebPageTest API key.
  @option location   {string}  WebPageTest location, defaults to `Dulles:Chrome`.
  @option connection {string}  WebPageTest connection speed, defaults to `Native
  Connection`.
  @option tests      {string}  Path to the test definitions JSON file, defaults
  to `tests.json`.
  @option count      {number}  Number of times to run each test, defaults to `9`.
  @option email      {string}  Email address to send notifications to.
  @option dump       {string}  Dump intermediate results to file.
  @option results    {string}  Read intermediate results from file, skips tests.
  @option mapper     {string}  Mapper to use, defaults to `html-comparison`.
  @option silent     {boolean} Disable logging, overrides `syslog` and `log`.
  @option syslog     {string}  Send logs to syslog, overrides `log`.
  @option log        {object}  Logging implementation, needs `log.info()`,
  `log.warn()` and `log.error()`.
  @option config     {string}  Load options from JSON config file.