Sets referral cookies to Intercom.io

referral-tracking-for-app.js

    window.intercomSettings = {
      ...
      "harpoon_referrer" : $.cookie('harpoon_referrer'),
      "utm_source"       : $.cookie('utm_source'),
      "utm_medium"       : $.cookie('utm_medium'),
      "utm_term"         : $.cookie('utm_term'),
      "utm_content"      : $.cookie('utm_content'),
      "utm_campaign"     : $.cookie('utm_campaign')
    };