title: friendly_id, Delete slug from history
body: <p>I am using <code>friendly_id</code> with the <code>history</code> module for a model called <code>page</code> and would like to be able to delete slugs from the <code>friendly_id_slugs</code> table so that they no longer redirect and can be used again.</p>
  
  <p>I have come up with a couple of possible solutions, but am unsure of how to proceed:</p>
  
  <ol>
  <li>Create a new model and controller for the <code>friendly_id_table</code> and do things as I would for any other model</li>
  <li>Add a <code>destroy_slug</code> action to <code>pages_controller.rb</code> that looks up the slug and destroys it - however, I'm unsure of how to load the slug, maybe <code>FriendlyId::Slug.find()</code></li>
  <li>Create a controller in the <code>FriendlyId</code> namespace - no idea how to do this</li>
  </ol>
  
  <p>Can anyone make a suggestion as the best way to proceed or how to accomplish #2 or #3?  Thanks!</p>