title: How to exclude PaperTrail versions from views in RailsAdmin
body: <p>I'm using RailsAdmin v0.6.8 with PaperTrail for versioning. </p>
  
  <p>The list, show, create and edit views for each of my has_paper_trail Models includes the versions attribute. In fact the create and edit views allow the addition/removal of versions, which doesn't really make sense to me. Other than using exclude_fields :versions for each view on each Model, is there a global way to do this?</p>
  
  <p>Thanks!</p>