Log Message:
Update to 3.56:

2007-01-12   Gisle Aas

     Release 3.56

     Cloning of parser state for compatiblity with threads.
     Fixed by Bo Lindbergh

     Don't require whitespace between declaration tokens.
     <http://rt.cpan.org/Ticket/Display.html?id=20864>

2006-07-10   Gisle Aas

     Release 3.55

     Treat <> at the end of document as text.  Used to be
     reported as a comment.

     Improved Firefox compatiblity for bad HTML:
      - Unclosed <script>, <style> are now treated as empty tags.
      - Unclosed <textarea>, <xmp> and <plaintext> treat rest \ 
as text.
      - Unclosed <title> closes at next tag.

     Make <!a'b> a comment by itself.