Documentation for wat-github

Some sections of the documentation (`@param` lines, `@default` lines, and some of the examples) don't display correctly (or at all) when I compile the docs. Not sure why (I just followed the YUIDoc Syntax Reference), but I left them in there anyway.

Also, I added a `files-saved` event to wat-github so that wat-wat could set `window.location.hash` (rather than wat-github doing it), because it makes more sense that way.