Adds a diff function to http://gist.github.com/
OUTDATED! gist.github.com supports diff view out of the box now.
This Chrome extension is a direct port of Greasemonkey script "Diff for gist.github" http://userscripts.org/scripts/show/62706 by ucnv.
Source code: https://github.com/NV/diff-for-gist.github
See also: GitHub Markdown Preview https://chrome.google.com/extensions/detail/cpojebknccclkjabfngjlcknonpmhhol
1.1 Works again!
1.2 Fixed in Chrome 13+