title: Un-ignore a directory added to .gitignore
body: <p>What I did was to have two branches:</p>
  
  <ul>
  <li>local</li>
  <li>production</li>
  </ul>
  
  <p>In my <code>local</code> branch I have all my asset folders <code>css</code>, <code>js</code>, and <code>img</code>. And in my <code>production</code> branch I added them to my <code>.gitignore</code> since I want to host those assets elsewhere.</p>
  
  <pre><code>css/
  img/
  js/
  </code></pre>
  
  <p>so these folders aren't visible in the <code>production</code> branch anymore. Is there anyway to restore the <code>img</code> folder in the <code>production</code> branch? I tried removing <code>img/</code> from my <code>.gitignore</code> and committing but it won't list on my untracked files.</p>