HiDPI (32x32px) favicon.ico

32x32-only version. Tested in IE6+, Safari 4+, and the latest Chrome,
Firefox, and Opera.
Merge pull request #1286 from jonathantneal/issue-1285

HiDPI (32x32px) favicon.ico - Issue #1285
Update CHANGELOG
v4.0.3
Mention Normalize.css in humans.txt

Normalize.css was missing from the stock humans.txt's technology
colophon.
Improve copy in `CONTRIBUTING.md`

Reflect some of the recent changes in necolas/issue-guidelines that tidy
up the language and simplify parts of the guidelines.
Update to jQuery 1.9.0