title: Assetic (Symfony) - Font Awesome doesn't work in dev environment
body: <p>I'm trying to figure out how to make this icon font work in the dev environment of Symfony. In production environment, everything works fine. I'm using assetic to manage my assets. I downloaded font-awesome with bower. Here's my code:</p>
  
  <h2>config.yml</h2>
  
  <pre><code># Assetic Configuration
  assetic:
      debug:          "%kernel.debug%"
      use_controller: false
      bundles:        [ AdminBundle, UserBundle, ShopBundle, SiteBundle ]
      filters:
          cssrewrite: ~
  </code></pre>
  
  <h2>base.html.twig</h2>
  
  <pre><code>{% block stylesheets %}
      {% stylesheets
          'vendor/bootstrap/dist/css/bootstrap.css'
          'vendor/font-awesome/css/font-awesome.min.css'
  
          filter='?cssrewrite'
      %}
          &lt;link rel="stylesheet" type="text/css" href="{{ asset_url }}" /&gt;
      {% endstylesheets %}
  {% endblock %}
  </code></pre>
  
  <h2>Snippet from rendered html</h2>
  
  <pre><code>&lt;html&gt;
    &lt;head&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;title&gt;Admin Area&lt;/title&gt;
      &lt;link href="/stocksolutions/web/app_dev.php/css/00007d5_bootstrap_1.css" type="text/css" rel="stylesheet"&gt;
      &lt;link href="/stocksolutions/web/app_dev.php/css/00007d5_font-awesome.min_2.css" type="text/css" rel="stylesheet"&gt;
      &lt;link href="/stocksolutions/web/app_dev.php/css/b4f457d_part_1_admin_1.css" type="text/css" rel="stylesheet"&gt;
      &lt;link href="/stocksolutions/web/favicon.ico" type="image/x-icon" rel="icon"&gt;
     &lt;/head&gt;
     &lt;body&gt;
      (...)
  
      &lt;script src="/stocksolutions/web/app_dev.php/js/ddd7e15_jquery.min_1.js" type="text/javascript"&gt;&lt;/script&gt;
      &lt;script src="/stocksolutions/web/app_dev.php/js/ddd7e15_bootstrap.min_2.js" type="text/javascript"&gt;&lt;/script&gt;
  
     &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <h2>font-awesome css-file</h2>
  
  <pre><code>@font-face {
      font-family: "FontAwesome";
      font-style: normal;
      font-weight: normal;
      src: url("../fonts/fontawesome-webfont.eot?#iefix&amp;v=4.1.0") format("embedded-opentype"), url("../fonts/fontawesome-webfont.woff?v=4.1.0") format("woff"), url("../fonts/fontawesome-webfont.ttf?v=4.1.0") format("truetype"), url("../fonts/fontawesome-webfont.svg?v=4.1.0#fontawesomeregular") format("svg");
  }
  </code></pre>
  
  <h2>Directory Structure</h2>
  
  <pre><code>- web
  --- css
  --- fonts
  --- js
  ...
  </code></pre>
  
  <p>Anyone who can help me with this? </p>