title: jQuery Datatables: export filter on rows and columns
body: <p>I am trying to export only visible columns and filtered columns to csv.</p>
  
  <p>I am using </p>
  
  <pre><code>{"sExtends": "xls", "mColumns":"visible", 
  "oSelectorOpts": { "filter": "applied", "order":"current"}
  }
  </code></pre>
  
  <p>but hidden columns are still on export.</p>
  
  <p>When I remove <code>oSelectorOpts</code>, I can see only visible columns on export. Perhaps <code>mColumns</code> and <code>oSelectorOpts</code> are conflicting? </p>