Log Message:
Update rabbit to 0.5.7.

== Changes 0.5.7 from 0.5.6: 2008-07-21

  * Bug fixes
    * fixed broken PDF generation
  * Improvements
    * supported GTK+/Quartz (Mac OS X native UI)
    * supported context menu with Control + left click
      (suggested by OBATA Akio)
    * align = XXX accepts :right or "left" too
    * supported nested labels in (('note:XXX:YYY:...')) form
    * added "Next" and "Previous" actions that consider pause.
    * added "ResetTimer" action
    * do fullscreen as first as possible when --fullscreen
      command line option is specified
    * supported {{wait}} and {{br}} markup on Wiki format
    * fixed dirty sample slide
  * Theme
    * added body margin
    * added "dash" item mark
    * stopped to use vivid colors for list item mark
    * added properties
    * added new themes:
      * newline-in-title: supports '\n' newline notation
      * edge-info-toolkit: displays information at the edge
        of slide
      * slide-header-info: displays information at the header
        of slide
      * slide-footer-info: displays information at the footer
        of slide
      * footer-logo: displays logo image at the footer of slide
      * blue-bar: a theme that displays bars at the top and
        bottom of slide
      * clear-blue: clear blue theme

== Changes 0.5.6 from 0.5.5: 2008-04-21

  * removed RTtool
  * supported Ruby 1.9 a bit
  * supported pause