Configure Polymer web-component-tester to use a Selenium Grid server

I need to configure the Polymer web-components-tester to use a Selenium Grid running at http://ift.tt/16qMLzh so I can run my tests on Jenkins. What is the Grunt config for this? I guessing something like this:

'wct-test': {
  local: {
    options: {
      activeBrowsers: [{
        browserName: 'chrome',
        url: 'http://ift.tt/16qMLzh'
      }]
    }
  }
}