Use MEDIA_SERIAL on dashboard images.

Review Request #1896 — Created Nov. 7, 2010 and submitted — Latest diff uploaded

Information

Review Board
https://github.com/bhollis/reviewboard/tree/media_serial

Reviewers

This is similar to http://reviews.reviewboard.org/r/1887/ and makes sure that all images on the dashboard correctly include MEDIA_SERIAL, which not only makes them cache properly when served with far-future expires headers, but prevents the same images from being fetched twice on the same page with two different URLs.
Checked that all dashboard images now serve with a consistent URL that includes the MEDIA_SERIAL.