title: opencv 3.0 contrib seeds.py
body: <p>I'm trying to use <code>opencv_contrib</code> modules but after built the latest <code>opencv (3.0)</code> and <code>opencv_contrib</code> with success, when I run the sample in <code>opencv_contrib</code> folder in python2 subfolder I get this:</p>
  
  <pre><code>opencv_contrib/samples/python2$ python seeds.py
  
  This sample demonstrates SEEDS Superpixels segmentation
  Use [space] to toggle output mode
  
  Usage:
    seeds.py [&lt;video source&gt;]
  
  
  init done 
  opengl support available 
  Traceback (most recent call last):
    File "seeds.py", line 54, in &lt;module&gt;
      seeds = cv2.ximgproc.createSuperpixelSEEDS(width, height, channels,
  AttributeError: 'module' object has no attribute 'ximgproc'
  </code></pre>
  
  <p>What I missed?</p>