Update from version 0.63 to version 0.64.
Changes:
0.64 Sun August 3, 2008
    * Class::MOP::Immutable
      - fixing subtle edge case in immutable when you
        call ->meta (stevan)
      - clean up option processing (nothingmuch)
    * Class::MOP::Instance
      - inlined initialize slot didn't match
        non-inlined (nothingmuch)

(seb)