Fix one of the issues you see with metaclass incomat when you have a moose-non moose...

Fix one of the issues you see with metaclass incomat when you have a moose-non moose-moose @ISA chain. Specifically, this affects Catalyst applications if you want to run 5.80, have a Moose native application, but extend a controller base class from CPAN which hasn't been ported to Moose yet. This also changes a few private methods to pass the metaclass instance, rather than the class name - as we now have it sooner ergo it's neater.