Condensed transition JavaScript
Added Darkly to default theme list
Added better fonts

Source Code Pro is now used, with the default Boot{strap,swatch}
monospaced fonts used when JavaScript isn't available.
Hid glyphicons when JavaScript isn't enabled

While they don't, strictly speaking, require JavaScript, NoScript blocks
web fonts along with JavaScript on untrusted sites, so the best way to
not show broken glyphs is to just hide the icons with CSS then unhide
them with JavaScript.