title: Assetic automatic cache busting without query?
body: <p>I couldn't find much information on this.</p>
  
  <p>I want to compile all css (and js indeed) files into something like this:</p>
  
  <pre><code>css/all-c498dsfbc.css
  </code></pre>
  
  <p>Right now I'm only able to get these:</p>
  
  <pre><code>css/all.css
  css/c498dsfbc.css
  css/all.css?v=123
  </code></pre>
  
  <p>The first one sucks, because it has no cache busting at all.</p>
  
  <p>The second one generates a hash which could be used for cache busting, but for some reason it doesn't change when I change something in my .css files and then run again this:</p>
  
  <pre><code>$ php app/console assetic:dump --env=prod --no-debug
  </code></pre>
  
  <p>The third one sucks too because I'm required to change the version manually, as explained here: <a href="http://symfony.com/doc/current/reference/configuration/framework.html#ref-framework-assets-version" rel="nofollow">http://symfony.com/doc/current/reference/configuration/framework.html#ref-framework-assets-version</a>. Also, I don't think using queries for this is a good idea (I think some browsers or CDN might not like that). It would be much better if the filename was changed: 'all-c498dsfbc.css'. This is how it's done in Rails if I remember correctly.</p>
  
  <p>Any thoughts?</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Seem like this feature is missing, I can't believe it: <a href="https://github.com/kriswallsmith/assetic/pull/190" rel="nofollow">https://github.com/kriswallsmith/assetic/pull/190</a></p>