Log Message:
Update from version 0.20 to 0.21.  Changes:

0.21  Mon Aug 11 2008
    - add a cookbook entry for converting an existing config to
      Config::General format
    - fix up pod to explain in more detail how to pass options to each
      driver class (Sergio Salvi)
    - add nice syntax for plugins to match models/views/controllers (ilmari)