For version 0.6.x:
- Figure our the right way to destroy the menu and everything in it.

For version 0.7.x:
- Add support for putting regular files in the menu.
- Figure out how to get the ROX-Filer specified icon for a file or 
  directory.

For version 1.x:
- Figure out how to send messages to a running ROX-Menu instance.
- Figure out an efficient way to monitor the filesystem for changes.
- Update the menu without rebuilding it.
