In accordance with http://feedvalidator.org, Hudson's RSS feeds do not properly
validate. Ruby's validating parser of RSS also complains about date format.

1. pubDate must be an RFC-822 date-time: 2006-11-18T15:36:32Z
See http://feedvalidator.org/docs/error/InvalidRFC2822Date.html

2. author must include an email address: Hudson

See http://feedvalidator.org/docs/error/InvalidContact.html
for explanation.