title: Blacklist for filters
body: <p>Plupload has ability to filter by extension.
  In documentation, in the plupload settings:
  White extensions list:</p>
  
  <pre><code>filters : [
      {title : "Image files", extensions : "jpg,gif,png"},
      {title : "Zip files", extensions : "zip"}
  ]
  </code></pre>
  
  <p>Is it possible to make extensions blacklist, for example:</p>
  
  <pre><code>filters : [
      {title : "All files", extensions : "*"},
      {title : "Exclude files", extensions : "!exe"}
  ]
  </code></pre>