title: Where can I find Google Maps v3 markermanager.js
body: <p>It appears that markermanager.js is no longer available on googlecode.com which has been closed. I have looked for an equivalent on Github, but so far without success. I can find marker-clusterer etc. but my code is built to run with markermanager.js.</p>
  
  <p>Can anyone tell me where it has gone, please?</p>