Update rabbit to 0.5.5.
While here, marked as DESTDIR ready.

== Changes 0.5.5 from 0.5.4: 2008-03-01

  * Bug fixes
    * fixed tests (reported by OBATA Akio)
    * fixed --margin option
  * supported HikiDoc installed by RubyGems
  * removed Tgif related files (reported by OBATA Akio)
  * removed needless windows-adjust theme
  * stopped to show progress message when index page is generating
  * added --log-level option
  * added document for MacPorts
  * rabbit-mode.el:
    * removed a needless variable.

(obache)