R1:b50cdc6e439c

Highlight update time in revision list

Summary:
This is another experiment for reducing reviewers response time.
I stole the idea (and colors) from [[ http://www.reviewboard.org/media/screenshots/2009/02/02/dashboard.png | ReviewBoard ]].
I actually quite like it (except when everything is red) and I can image that people will review just to have better color balance.

The code is not production ready for these reasons:

- We load holidays again and again for each revision. I couldn't cache it to static…