[real-world uses] Add IPython

doc/realworld.html

@@ -88,6 +88,7 @@
       <li><a href="http://haxpad.com/">HaxPad</a> (editor for Win RT)</li>
       <li><a href="http://megafonweblab.github.com/histone-javascript/">Histone template engine playground</a></li>
       <li><a href="http://icecoder.net">ICEcoder</a> (web IDE)</li>
+      <li><a href="http://ipython.org/">IPython</a> (interactive computing shell)</li>
       <li><a href="http://i-mos.org/imos/">i-MOS</a> (modeling and simulation platform)</li>
       <li><a href="http://www.janvas.com/">Janvas</a> (vector graphics editor)</li>
       <li><a href="http://extensions.joomla.org/extensions/edition/editors/8723">Joomla plugin</a></li>