Update to 0.68:

0.68 Sat Sep 11 16:24:42 2010
    [CHANGES]
    * Remove an optional depenency, Data::Util.
      This is used to make method modifiers faster, but the effect
      is limited to 'before' and 'after' modifiers. Rather,
      D::U's modifiers are slightly different from the standalone version,
      and sometimes the difference caused problems.

0.67 Fri Sep 10 13:56:38 2010
    [BUG FIXES]
    * Oops! Fix a mistake of removing neccesary denepdencies

0.66 Fri Sep 10 13:30:41 2010
    [BUG FIXES]
    * Workaround older perl's bug that caused segv in throwing errors
    * Fix looks_like_number portability

0.65 Thu Sep 9 13:30:33 2010
    [CHANGES]
    * An attribute in a subclass can now override the value of "is"
      (Moose 1.07 feature)
    * Remove long deprecated methods:
      _create_args(), compute_all_applicable_attributes(),
      and clone_instance()

    [BUG FIXES]
    * Fix tests that misused test functions. This problem was revealed
      by Test::Builder2
    * Improve C++ compatibility in Mouse::XS

(wiz)