title: Image not appearing in ipython notebook when in a non-sub directory
body: <p>I'm trying to display a png image in an ipython notebook from an absolute path <code>/Users/zhermes/[...]/image.png</code>, using the code</p>
  
  <pre><code>&lt;img src="/Users/zhermes/[...]/image.png" style="width: 80%"&gt;
  </code></pre>
  
  <p>but it won't embed (it produces a broken image icon).  I've confirmed that the path is correct using:</p>
  
  <pre><code>In: print os.path.exists('/Users/zhermes/[...]/image.png')
  Out: True
  </code></pre>
  
  <p>If I make a copy of the image in the local directory, i.e. : <code>./image.png</code>, then this works fine:</p>
  
  <pre><code>&lt;img src="image.png" style="width: 80%"&gt;
  </code></pre>
  
  <p>similarly its fine if I have a local subdirectory like <code>./images/image.png</code></p>
  
  <p>What's going wrong here?</p>
  
  <hr>
  
  <p>Edit: using <code>IPython.display.Image</code> <em>does</em> work, but I'd prefer to use markdown.</p>