title: Apply PaperTrail to all models
body: <p>I don't think there is an easy way to apply PaperTrail to all model except by declaring <code>has_paper_trail</code> in each one.
  What I want to accomplish is to leverage the features of PaperTrail (or another gem, like Auditable, Vestal Versions) to all the models. For example, I want to include models generated by gems and engines (Rails 3).</p>
  
  <p>Any pointers on how to apply a "global" PaperTrail (or similar gem)?</p>