Update rabbit to 0.9.0.

Update rabbit to 0.9.0.

== Changes 0.9.0 from 0.6.5: 2010-09-26

Applied defalut custom tag styles.

=== Improvements

==== Theme

  * background-image-toolkit: Added vertical-align
    paramteter that specifies vertical position.

    Example:
      # image
      # src = lavie.png
      # relative-width = 30
      # align = right
      # vertical-align = top
      # relative-margin-right = -5

  * tag: New theme. It provides default style for some
    custome tags. The following custom tags are supports. It
    is enabled by default.

    * tag:x-large: Made specified text large.
    * tag:center: Placed specified text in center If no text
      is specified, block that has center tag is placed in
      center.
    * tag:right: Placed specified text in right If no text
      is specified, block that has right tag is placed in
      right.

    Example:
      (('tag:x-large:Large Text'))

      (('tag:center'))Centerized Text

      (('tag:right'))Right-Justified Text

==== RD

  * Supported recursive markup in (('('))('XXX:')((')')) markup.

  * Supported markup in cells in table.

=== Fix

  * Fixed missing require.
    [Reported by OBATA Akio]
  * Fixed aafigure's site URL.
    [Reported by kdmsnr]
  * Changed default align to center of
    background-image-toolkit theme for backward compatibility.
    [Suggested by nari]
  * Renamed Rabbitter to Rabbiter.