Fixed URLs that weren't relative or were just wrong
Added striped background.  Had to rework header background to be compatible
Tweaked navbar spacing
Disabled old h2 css (should remove later), shrank IRC header, and made it more descriptive
CSS cleanup, and improved striped gradient background

- switched to Stylus for css file
- lots of values are now in variables, reducing duplication
- gradient and striped backgrounds can be toggled on/off
- striped background now being programmatically generated, looks prettier (IMO)
Turned off jade's pretty-printing of html (messes up formatting sometimes)
Fixed indentation glitch in docpad.coffee
Added template helper function to compute a relative URL, useful when you don't know if your site will be hosted at the root of a domain
Big navbar update: it's prettier (copied Wareya's style) and is auto-generated

- current page's link has different style
- css switched to classes, less descendant selectors
- documents place themselves in the navbar using metadata
- added un-rendered document to simulate the "forum" page that must be linked to
Styles and scripts are now referenced using relative URLs
Added sub-nav: second-level row of navigation links
Download page now renders with the full-size header.  Smaller header is now only being used for the IRC page
Added a stub "News" page, but haven't thought about a proper layout
Copied ajf's ClassSelectController JS port
ClassSelectController now downloads images from a path that can be set by the containing page
ClassSelectController now renders canvas into an element with a special class, instead of always appending to <body>
Added "Greet the Gang" page that displays ajf's ClassSelectController JS port

- doesn't handle small screens well, ATM.  Not sure what to do about that.  Hide it altogether and show a more boring, static list of the classes?
Fixed capitalization typo in URL of ClassSelectController script
Disabled extending center column to the footer.  When there's no content down there, it seems better to leave the background visible