TODO

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