title: php app/console assetic:dump produces unwanted files
body: <p>I've installed some components, such as foundation, jquery, etc, in my Symfony 2.8 application. I've also installed <code>assetic</code> in order to use these components, I thought, more easily.</p>
  
  <p>I've the following configuration for <code>assetic</code> in my <code>config.yml</code> file:</p>
  
  <pre><code>...    
  
  assetic:
  
      debug:          "%kernel.debug%"
  
      bundles:
          # Defaults (all currently registered bundles):
          - FrameworkBundle
          - SecurityBundle
          - TwigBundle
          - MonologBundle
          - SwiftmailerBundle
          - DoctrineBundle
          - SensioFrameworkExtraBundle
          - AsseticBundle
  
      filters:
          cssrewrite: ~
  
      assets:
  
          normalize_css:
              inputs:
                  - %kernel.root_dir%/../components/normalize-css/normalize.css
              filters: [cssrewrite]
  
          foundation_min_css:
              inputs:
                  - %kernel.root_dir%/../components/foundation/css/foundation.min.css
              filters: [cssrewrite]
  
          jquery:
              inputs:
                  - %kernel.root_dir%/../components/jquery/jquery.js
  
          foundation_min_js:
              inputs:
                  - %kernel.root_dir%/../components/foundation/js/foundation.min.js
  </code></pre>
  
  <p>but when I type the following command on the console to generate statically the files under the <code>web</code> folder:</p>
  
  <pre><code>php app/console assetic:dump
  </code></pre>
  
  <p>I obtain, I think, multiple versions of the same file but named differently:</p>
  
  <p><a href="https://i.stack.imgur.com/Lfgj9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lfgj9.png" alt="enter image description here"></a></p>
  
  <p>Why is that happening and how can I avoid it?</p>