Added a new UserManager, a simple API for modules to get notices of user join/leave and presenter events

Fix for several 0.7 release bugs, as well as a new way for modules to receive updates about users joining and leaving

 - remove the extra param to prevent caching of swf files as the swf files are now unique for each build

 - renamed config.xml to config.xml.dev. The config.xml is changed by each developer and sometimes gets checked-in
   which is a little annoying. Developers must now copy config.xml.dev to config.xml. The config.xml is added to
   .gitignore so it doesn't get checked-in.

 - precompute x and y coordinate before assigning to cursorImg to prevent flickering and jerky mouse pointer

- have to include a new anat-contrib.jar (need to figure out how to externalise this)

- create a config.xml template so we can substitute build numbers to create config.xml. This way, we get around the
caching problem of modules when we have new releases.