[real-world uses] Add CodeBitt

Author: owen-m1

doc/realworld.html

@@ -43,6 +43,7 @@ <h2>CodeMirror real-world uses</h2>
       <li><a href="http://complete-ly.appspot.com/playground/code.playground.html">Complete.ly playground</a></li>
       <li><a href="https://codeanywhere.com/">Codeanywhere</a> (multi-platform cloud editor)</li>
       <li><a href="http://drupal.org/project/cpn">Code per Node</a> (Drupal module)</li>
+      <li><a href="https://codebitt.com/">CodeBitt</a> (Code snippet sharing)</li>
       <li><a href="http://www.codebugapp.com/">Codebug</a> (PHP Xdebug front-end)</li>
       <li><a href="https://github.com/angelozerr/CodeMirror-Eclipse">CodeMirror Eclipse</a> (embed CM in Eclipse)</li>
       <li><a href="http://emmet.io/blog/codemirror-movie/">CodeMirror movie</a> (scripted editing demos)</li>