Log Message:
Update ruby-rdoc to 3.12.1.

=== 3.12.1 / 2013-02-05

* Bug fixes
  * Fixed an XSS exploit in darkfish.js.  This could lead to cookie disclosure
    to third parties.  See CVE-2013-0256[rdoc-ref:CVE-2013-0256.rdoc] for full
    details including a patch you can apply to generated RDoc documentation.
  * Ensured that rd parser files are generated before checking the manifest.