title: Delete all versions of paper_trail when delting a model
body: <p>I'm using the paper_trail gem for a blogging system to store versions of the article.  However I don't need to keep any version of an article after it has been destroyed. </p>
  
  <p>How can I delete all versions of a model instance when it's destroyed?  I only see in the documentation a way to delete versions globally.  </p>
  
  <p>Any ideas?</p>