Zope-app-security

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- Bug: The `gopherlib` module has been deprecated in Python 2.5. Whenever the
ZCML of this package was included when using Python 2.5, a deprecation
warning had been raised stating that `gopherlib` has been
deprecated. Provided a simple condition to check whether Python 2.5 or later
is installed by checking for the deleted `regex` module and thus optionally
load the security declaration for `gopherlib`.

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- Feature:
`zope.app.security.principalregistry.PrincipalRegistry.getPrincipal` returns
`zope.security.management.system_user` when its id is used for the search
key.

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- Initial release independent of the main Zope tree.