Update Changes file
New 'file' type
 - edit and view components
 - edit component w/file chooser and thumbnail display
- add jQueryFileTree (https://github.com/daverogers/jQueryFileTree)
  w/modifications:
   - use the rel attribute w/o escaping so the plack app understands
   - use the dir as script name.

CAVEAT

- Currently really only works for one file per page, and for images
  (jpg/png).
- Image::Scale doesn't like capital letters (JPG/PNG)
- I use my own Plack::App::TemplatedDirectory. There is a
  Plack::App::Directory::Xslate, but it doesn't seem to do what I want
  at all.
- Styling could be better, especially if the list gets too large. There
  may be ideas here:
  http://labs.abeautifulsite.net/archived/jquery-fileTree/demo/