Log Message:
Update Rabbit to 0.5.8.

== Changes 0.5.8 from 0.5.7: 2008-10-18

  * Improvements
    * supported Clutter
      * supported page transition
      * supported new comment view that flow comments on a slide.
    * supported IRC backend
      * RabbIRC (akira yamada)
  * Theme
    * added shadow to quote marks
    * try to use Hiragino font if available
    * add a new theme
      * newline-in-slides: supports '\n' newline notation
  * Bug fixes
    * fixed too much grabbed problem on magnifier mode
    * reworked Tofu backend
    * fixed a problem that was reported on Asakusa.rb