Make game UUIDs monospaced
Join a game after creating it

- Added a new XHR class and context to make sequencing AJAX calls
easier.
- Added contextify utility to fn.coffee, to share the pattern across
dom.Table, dom.Put, and xhr.Do.
Add docs target

Using docco to generate documentation.
Adding minimal package.json to track dependencies
Adding a lot of comments and reorganizing

game_list makes more sense as one file, since it's so small.