Log Message:
Update rabbit to 0.5.4.

== Changes 0.5.4 from 0.5.3: 2007-12-15

  * Documentation update
    * fixed ruby.st's URL (kitaj)
    * updated document of MacPorts (kimura wataru)
  * Theme related
    * added some color configuration to night-black theme
    * added slide-logo theme
    * added slide-footer theme
  * Bug fixes
    * fixed cairo backend availability check
    * fixed Wiki parser loading bug (reported by OBATA Akio)
    * suppressed warnings on Windows
    * fixed "/" handling on Windows (JunichiNakai, OBATA Akio)
  * logged progress in background (suggested by OBATA Akio)
  * changed default print format to PDF
  * supported "check" for itemize mark
  * added --show-native-window-id option
  * supported <<< LANG\n...\n>>> with Wiki parser
  * added block quote sample
  * supported an image file as source (Rabbit can be an image viewer)
  * added as_large_as_possible image size option
  * removed config.rb on 'setup.rb clean' (Kobayashi Noritada)
  * removed Tgif support
  * added --man option (Kobayashi Noritada)
  * supported slideshare.net as source
  * supported DnD