Fixing Zen's false out-of-date update status warning

zen theme claims out of date
zen theme update status out of date

See issue:
Sub-theme's .info file triggers incorrect "out of date" flag in update module
http://drupal.org/node/254821

Resolved:
git commit -m "Remove date from zen subtheme .info to remove bogus Zen theme needs updating message."

git get the diff of a file revision ago