title: Symfony using assetic and cssrewrite for resources in app directory
body: <p>I use symfony assetic to load resources like that:</p>
  
  <pre><code>{% stylesheets filter='cssrewrite'
      '../app/Resources/css/bootstrap.min.css'
      '../app/Resources/css/jquery-ui.css'
      '../app/Resources/css/pagination.css'
      '../app/Resources/css/dropzone.css'
      '../app/Resources/css/angular-bootstrap-lightbox.css'
  %}
  </code></pre>
  
  <p>All of these resources are located in symfony's <code>app/Resources</code> directory. Unfortunately this doesn't work if an image URL is used in a CSS file. I know that if my resources where in a bundle I would need to use paths like  <code>bundles/app/css/style.css</code> and CSS rewrite would work. But how do I get it working when resources are in main <code>app</code> directory?</p>