title: AttributeError: 'module' object has no attribute 'load'
body: <p>I am using opencv3.1.0.
  While I am trying to run:</p>
  
  <pre><code>import cv2.cv as cv  
  import cv2 
  
  cascade = cv.Load('/usr/share/OpenCV/haarcascades/haarcascade_frontalface_alt2.xml')
  </code></pre>
  
  <p>I find that cv2.cv is not in opencv3, so I change cv2.cv to cv2
  and then I get the error message in the title.</p>
  
  <p>Any thoughts? 
  Many thanks.</p>