title: Rails sanitize remove default allowed tags
body: <p>How would I use sanitize, but tell it to disallow some enabled by default tags? The <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html" rel="nofollow">documentation</a> states that I can put this in my <code>application.rb</code></p>
  
  <pre><code>config.after_initialize do
    ActionView::Base.sanitized_allowed_tags.delete 'div'
  end
  </code></pre>
  
  <p>Can I instead pass this as an argument to sanitize?</p>