Log Message:
Update from version 0.67 to version 0.68.

Changes:
0.68 Fri October 25, 2008
    * Class::MOP
      - Make load_class require by file name instead of module name.
        This stops confusing error messages when loading '__PACKAGE__'.
        (Florian Ragwitz)
      - Add load_one_class_of function to enable you to load one of a
        list of classes, rather than having to call load_class multiple
        times in an eval. (t0m)