title: Format for storing cookies in a txt file and serving it to phantomjs
body: <p>I am trying to send cookies to phantomjs while starting the driver
  <code>phanton.add_cookie({})</code> works. </p>
  
  <p>I want to keep a list of cookies in a file and pass them as arguments while launching phantomjs</p>
  
  <p>I found that <code>webdriver.PhantomJS(service_args=['--cookies-file=/tmp/ph_cook.txt'])</code> would add a given <code>txt</code> file at launch.</p>
  
  <p>The problem is I do not know what format this txt file should be of. I tried using a map with key value pair, but no gain.</p>