message: References the correct model
diff: doctype xml
  rss(version='2.0', xmlns:atom='http://www.w3.org/2005/Atom')
  channel
  - title Are.na / #{user.get('username')}
  + title Are.na / #{author.get('username')}
  link #{sd.APP_URL}#{author.href()}
  atom:link(href="#{sd.APP_URL}#{author.href()}/feed/rss", rel='self', type='application/rss+xml')
  if author.has('metadata')
  