add RSS renderer

Ticket

add RSS renderer+status
add RSS renderer+priority
add RSS renderer+commit
 

 

add RSS renderer+solution

Make sure to use absolute URLs in rss.

 

Also, probably good to support enclosures in feeds at the same time as doing this.

 

 

I've converted all the existing functionality into the RSS framework.  I haven't added all the new stuff we want yet, but we can make tickets for those.