title: HTML example to use the non-compiled development version of xtk does not work
body: <p>I'm trying to run the development version of xtk (it's the 1st time I use github, and I'm fairly new to javascript...):</p>
  <ul>
  <li><p>I did as indicated in <a href="https://github.com/xtk/X/wiki/X:DevelopersHeadsUp" rel="nofollow noreferrer">https://github.com/xtk/X/wiki/X:DevelopersHeadsUp</a>, forked xtk, cloned it into my computer and run utils/deps.py. It is now sitting at ~/myself/X,</p>
  </li>
  <li><p>Next I wrote an html file at ~/myself/X.html with the example html code in DevelopersHeadsUp,</p>
  </li>
  <li><p>because my .html file is at the same level as the X directory, I changed the src=&quot;../X/lib/closure-library/closure/goog/base.js&quot; lines to src=&quot;X/lib/closure-library/closure/goog/base.js&quot;,</p>
  </li>
  <li><p>I opened X.html with Safari (5.1.7)...</p>
  </li>
  </ul>
  <p>... and it doesn't work.</p>
  <p>I get these 2 errors in the console:</p>
  <blockquote>
  <p>TypeError: 'undefined' is not a constructor (evaluating 'new goog.structs.Map()')</p>
  <p>X.html:19TypeError: 'undefined' is not a constructor (evaluating 'new X.renderer3D()')</p>
  </blockquote>