Update rabbit to 0.6.1.

== Changes 0.6.1 from 0.6.: 2009-07-17

=== Improvements

  * Images are rendered after resized by Gdk::Pixbuf on
    display mode.
  * Theme
    * lightning-talk-toolkit: supported :hide-title
    * slide-show: timer is reset after each loop
    * slide-show: default slide show span is computed from
      allotted time and slide size.
  * "\n" is available by default.
  * Wiki format supports slide property.
  * RD format supports 'wait' in nested itemize. [Kazuhiro NISHIYAMA]

=== Fixes

  * Added missing GPL license file.
  * Fixed a problem that PDF isn't resized on display size change.
  * Fixed a problem that index mode doesn't work for title
    only slide. [rabbit-shockers:654] [OBATA Akio]
  * Fixed a problem that block wait doesn't work. [OBATA Akio]

(obache)