title: Wrong image path in liip imagine
body: <p>Im using vich uploader to upload images and oneup flysystem file abstraction. Also liip imagine bundle to make thumbnails.</p>
  
  <p>The problem is that liip takes my oneup flysystem adapters local path and tries to find <code>uploads/58998d6502406.png</code> image in it. When i remove <code>uploads</code> prefix, then it works else throws source file not found exception.</p>
  
  <p>Maybe i am missing something in my configuration?</p>
  
  <p>Twig:
  <code>&lt;img src="{{ vich_uploader_asset(partner, 'imageFile') | imagine_filter('my_thumb') }}" /&gt;</code> (also tried with asset)</p>
  
  <p>generated url:
  <code>http://app.dev/media/cache/resolve/my_thumb/uploads/58998d6502406.png</code></p>
  
  <p>url that works:
  <code>http://app.dev/media/cache/resolve/my_thumb/58998d6502406.png</code></p>
  
  <p>My configuration:</p>
  
  <pre><code># OneupFlysystem Configuration
  oneup_flysystem:
      adapters:
          uploads_adapter:
              local:
                  directory: "%kernel.root_dir%/../web/uploads"
      filesystems:
          uploads_fs:
              adapter: uploads_adapter
              mount:   uploads_fs
  
  # Vich uploader Configuration
  vich_uploader:
      db_driver: orm
      storage:   flysystem
      mappings:
          partner_image:
              uri_prefix: /uploads
              upload_destination: uploads_fs
              namer: vich_uploader.namer_uniqid
              delete_on_remove: true
              delete_on_update: true
          news_image:
              uri_prefix: /uploads
              upload_destination: uploads_fs
              namer: vich_uploader.namer_uniqid
              delete_on_remove: true
              delete_on_update: true
  
  # Liip imagine bundle Configuration
  liip_imagine:
      loaders:
          uploaded_images:
              flysystem:
                  filesystem_service: oneup_flysystem.uploads_fs_filesystem
      data_loader: uploaded_images
      filter_sets :
          my_thumb:
              filters:
                  thumbnail: { size: [120, 90], mode: outbound }
  </code></pre>