title: Show retweeters of a Twitter status in Tweepy
body: <p>I've been trying to find a way of doing the equivalent of:</p>
  
  <pre><code>retweeters_of('twitterstatusid')
  </code></pre>
  
  <p>I can't see an explicit method in <code>tweepy</code> - and couldn't work out any other way of finding this. Any help appreciated.</p>