Log Message:
Update to 1.500

Upstream changes:
1.500     2013-11-22T15:05:31Z

    - Format url fragments (in links to perldoc sections)
      according to the destination site (perldoc_url_prefix).
      This makes links to sections work where they probably never did before.
      They are also customizable.

    - Use multiple backticks to delimit code spans
      that contain literal backticks.

1.401     2013-11-06T05:30:55Z

    - Require Pod::Parser 1.51 for bug fixes.

1.400     2013-11-05T14:18:19Z

    [Output Changes]
    - Change perldoc urls to point to metacpan.

    [Bug Fixes]
    - Recognize numbered pod items that do not have a period.
      Thanks to Yasutaka ATARASHI for the pull request (gh-4).
    - Remove extraneous blank line between verbatim paragraphs.
      Thanks to Graham Ollis for the pull request (gh-5).
    - Do not escape markdown characters inside links (or file paths).
      Thanks to Taiki Kawakami for the pull request (gh-6).