[real-world uses] Add SourceLair

Author: parisk

doc/realworld.html

@@ -146,6 +146,7 @@ <h2>CodeMirror real-world uses</h2>
       <li><a href="https://www.shadertoy.com/">Shadertoy</a> (shader sharing)</li>
       <li><a href="http://www.sketchpatch.net/labs/livecodelabIntro.html">sketchPatch Livecodelab</a></li>
       <li><a href="http://www.skulpt.org/">Skulpt</a> (in-browser Python environment)</li>
+      <li><a href="https://www.sourcelair.com">SourceLair</a> (in-browser IDE for Django, Node.js, PHP and HTML5)</li>
       <li><a href="http://snaptomato.appspot.com/editor.html">Snap Tomato</a> (HTML editing/testing page)</li>
       <li><a href="http://snippets.pro/">Snippets.pro</a> (code snippet sharing)</li>
       <li><a href="http://www.solidshops.com/">SolidShops</a> (hosted e-commerce platform)</li>