Updates to Dojo VNC URLs

There were some inconsistencies in URLs/ports for the various dojo rooms due to hurried production. Please be aware that I have update the documentation for How To Host a VNC Session (Dojo Style) and How to join a live dojo lesson. Please update any other docs accordingly. Most importantly, the URL for accessing the screencast (/vncviewer) is no longer valid. Please update to http://www.webavant.com/dojo1, http://www.webavant.com/dojo2 or http://www.webavant.com/dojo3 accordingly. Thanks, and happy dojocasting!