mozilla/webpagemaker — pull request #460 by toolness (2012-06-26 22:14:36+00:00)
Title: Allow data URLs and the img 'alt' attribute.

This should fix #455. But I'm not super happy w/ the monkeypatching
approach I'm taking here, similar to my fix for #32. Might want to
eventually push this kind of configuration upstream to bleach too.