Update from version 0.11 to version 0.13.

Approved by MAINTAINER.

Pkgsrc changes:
- adjust dependencies

Upstream changes:
0.13  Wed 19 May 2010
  * Add load_first_existing_class (gfx)

0.12  Fri 02 Apr 2010
  * t/000-version.t for better diagnostics (tokuhirom)
  * Slight performance improvements for is_class_loaded,
      lazily loading Carp, etc (Sartak)
  * Start some real documentation (Sartak)
  * Document $ENV{ANY_MOOSE} (Sartak)
    - fixes [rt.cpan.org #52339]
  * Test that Moose is loaded, not CMOP (Sartak)
    - fixes [rt.cpan.org #56093]
  * Alias class_of and more functions (Sartak)
    - requested by [rt.cpan.org #52275]

(seb)