[Catalog-sig] PyPI trove classifiers for alternate language implementations

["Martin v. Löwis"]

> Programming Language - Python - Implementation - CPython
> Programming Language - Python - Implementation - pypy
> Programming Language - Python - Implementation - jython
> Programming Language - Python - Implementation - IronPython

Opinions on this proposal? (including the specific spelling,
leaving alone that the separator is ::, not -)

Regards,
Martin