Update HiDPI CSS `@media` rule

Provide greater cross-browser support. Thanks to Wordpress -
http://core.trac.wordpress.org/changeset/22629 - and @marcedwards - see
issue #1127.
Adjust CSS image-replacement

Make sure that any text-highlight, or other factors that may break the
illusion, are far enough outside the element to be unnoticed.

Fix gh-1239
Remove named function expression in plugins.js

Details on various bugs with named function expressions:
http://kangax.github.com/nfe/#jscript-bugs
Minor amend, closing a missing bracket.
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
Update to Normalize.css v1.1.0.
v4.1.0
Use relative paths in README

GitHub recently fixed a problem where relative paths in Markdown files
didn't behave as desired.

Fix gh-1296
Update jQuery to version 1.9.1
Recommend version-specific python server commands
Added IE10 tap highlight disable & WebKit→IE10 doc
Fix link to Pull Request help in CONTRIBUTING.md

GitHub changed their help page URLs and did not correctly redirect the
old Pull Request help URL.
Corrected terminology in comment

Really, really nitpicky change here but ... the comment was referring to the selection rule sets as "declarations", which isn't exactly the correct term. See:

http://nimbupani.com/css-vocabulary.html
http://www.impressivewebs.com/css-terms-definitions/
Merge pull request #1313 from impressivewebs/patch-1

Corrected terminology in comment