Log Message:
Update p5-IO-Multiplex to 1.13.

Changes from previous:
----------------------
1.13 Fri Apr 15 08:42:43 CEST 2011
	- fix handling of outbuf which contains '0'.
	  rt.cpan.org#67458 [Gordon Russell]

1.12 Wed Feb 23 22:35:27 CET 2011
	- fix MSWin32 complaints
	  rt.cpan.org#66096 [Mark Dootson]

1.11 Wed Feb  2 17:05:08 CET 2011
        - Avoid warning while adding pipe
          rt.cpan.org#60068 [Khedin] and #16259
	- Add EWOULDBLOCK and non-blocking mode for windows,
	  rt.cpan.org#23982 [junk@penilecolada.com]
	- Typo "closeing", rt.cpan.org#21085 [D Steinbrunner]
	- avoid shutdown after close,
	  rt.cpan.org#5715 [Lars Jensen] and #5885
	- use length of outbuf, not exists to see if it is
	  empty. [Ersun Warncke]
	- turn "use warnings" on