code: function(opts) {
  		opts.accesskey = opts.accesskey || opts.password;
  		delete opts.password;
  		if (opts.selenium.hostname.match(/ondemand.saucelabs.com/)) {
  			opts.SAUCE_USERNAME = opts.SAUCE_USERNAME || opts.username;
  			opts.SAUCE_ACCESSKEY = opts.SAUCE_ACCESSKEY || opts.accesskey;
  			if (typeof opts.SAUCE_USERNAME !== 'undefined' && typeof opts.SAUCE_ACCESSKEY !== 'undefined') {
  				opts.selenium.auth = opts.SAUCE_USERNAME + ':' + opts.SAUCE_ACCESSKEY;
  				delete opts.SAUCE_ACCESSKEY;
  				delete opts.SAUCE_USERNAME;
  			}
  		} else if (opts.selenium.hostname.match(/hub.browserstack.com/)) {
  			opts.BROWSERSTACK_USERNAME = opts.BROWSERSTACK_USERNAME || opts.username;
  			opts.BROWSERSTACK_KEY = opts.BROWSERSTACK_KEY || opts.accesskey;
  			if (typeof opts.BROWSERSTACK_USERNAME !== 'undefined') {
  				opts.browsers.forEach(function(browser) {
  					browser['browserstack.user'] = opts.BROWSERSTACK_USERNAME;
  					browser['browserstack.key'] = opts.BROWSERSTACK_KEY;
  				});
  				delete opts.BROWSERSTACK_USERNAME;
  				delete opts.BROWSERSTACK_KEY;
  				delete opts.selenium.user;
  				delete opts.selenium.pwd;
  			}
  		}
  
  		delete opts.username;
  		delete opts.password;
  		return opts;
  	}
docs: username and accesskey or password