title: Change root in NERDTree
body: <p>I tried to change the NERDTree root with</p>
  <pre><code>:BookmarkToRoot &lt;bookmark&gt;
  </code></pre>
  <p>command and with <code>C</code> letter but when I close vim and open vim the root is not changed.</p>
  <p>Do you know how to change the root forever?</p>