title: Custom ColumnTree node attributes
body: <p>By default, ColumnTree uses these attributes for the nodes: <code>text, id, leaf</code>. So, the server sould sends something like </p>
  
  <pre><code>{
      id: 1,
      text: 'A leaf Node',
      leaf: true
  }
  </code></pre>
  
  <p>What should i change in the ColumnTree options if my server sends custom params? Like:</p>
  
  <pre><code>{
      n: 1,
      folder: 'A leaf Node',
      leaf: true
  }
  </code></pre>