Graceful handling of devices witout (or with disabled) HTML5 location API
Icons bumped to retina resolution, plus some housekeeping

I've been playing around with SVGs, too, but (a) the difference in file
size is neglectable, and (b) they do not always render sharply on all
devices. Better to go with PNG-24 and run each PNG through
http://imageoptim.com or http://tinypng.org before publishing.