Update rabbit to 0.6.3.

== Changes 0.6.3 from 0.6.2: 2009-12-16

=== Improvements

  * [#180] Supported inline markup in DL with Wiki format.
    [kdmsnr]
  * Added butler rabbit to the standard theme.
  * Changed to use scaled images by default even when
    printing mode.
  * Supported pixbuf rendering with alpha channel.
    (when cairo is used as rendering engine)

==== Theme

  * Added:
    * lightning-monochrome:
      Takahashi method slide + monochrome normal slide
  * Changed:
    * default-block-quote: Added
      @block_quote_image_background_alpha parameter that
      specifies alpha channel of background images.
    * default-preformatted: Made auto text size adjustment
      optional. It is customized by
      @preformatted_keep_in_size parameter.
    * clear-blue: Displayed title in the left bottom by
      default. It can be disabled by the following theme:
        include_theme("clear-blue")
        @slide_footer_info_left_text = ""
  * Supported nest of "itemize > enum" and
    "itemize > itemize > enum".

==== Experimental

((*This maybe changed in the feature.*))

  * Supported tag:

    syntax:
        (('tag:name:content'))
      or
        (('tag:name'))content

    e.g.:
      slide.rab:
        (('tag:center'))Hi, look it!

      theme.rb:
        match("**", CustomTag) do |tags|
          tags.each do |tag|
            case tag.name
            when "center"
              tag.parent.horizontal_centering = true
            end
          end
        end

      output(before):
        +-------------------+
        | Hi, look it!      |
        +-------------------+

      output(after):
        +-------------------+
        |    Hi, look it!  |
        +-------------------+

=== Fixes

  * Fixed a problem that fullscreen doesn't work on Ruby 1.9
    [Masaki Suketa]
  * [#179] Fixed a problem that Rabbit sometimes crashes
    with mouse clicks. [kdmsnr]
  * newline-in-slides theme: Disabled newline substitution in
    preformatted text.
  * Fixed a problem that cursor isn't displayed after
    unfullscreen.

=== Thanks

  * Masaki Suketa
  * kdmsnr

(obache)