TODO

   1 - gmail-like labels for feed categories (needs ui thinking)
   2 - optional three column layout
   3 - optimize rpc responses (e.g. now forceUpdateFeeds returns all tag/feed/vfeed
   4 information, see if tags or feeds are required and return only them)
   5 - email notifications (digest/single-email mode)
   6 - download linked images and store them somewhere in case the links get broken
   7 - mark item as unread (maybe add combobox in view frame to mark as read/unread/starred)
   8 - "mark as read" is broken for vfeeds/searches