Unlimited buffer and command categories

[xgalaxy]

Hey, I changed the javascript so it appends the console output instead of stomping it each poll. The buffer on the server end is cleared each poll as a result. I had to remove the 'Clear' command as well since it doesn't make sense for it to live on the server. And added a clear button to the html page.

Added a command category and help will now list each command by category. I also improved the examples a bit by printing a hierarchical list of the game objects and some small formatting changes.