title: Getresponse API newsletter not working
body: <p>I have tried to send getresponse newsletter through API. Its not working as expected. i have followed the 
  <a href="https://github.com/GetResponse/DevZone/tree/master/API#send_newsletter" rel="nofollow">https://github.com/GetResponse/DevZone/tree/master/API#send_newsletter</a></p>
  
  <p>Here the code  <a href="http://pastebin.com/tWWKgpF5" rel="nofollow">http://pastebin.com/tWWKgpF5</a>   </p>
  
  <p>I'm not so sure which is wrong.</p>