Adding feeds (django 1.4)

Only working for a user in his /dashboard/feed/<username>
This work has been based on the original work available
for reviewboard on previous version working with django 1.2

I tested it on Chromium and Internet Explorer 8.
The RSS feed has been feeding my quite RSS client http://code.google.com/p/quite-rss/

My boss wanted a way to be notified in the systray of new code review without being harrassed by mails.