Bug#579873: GnuPG::Signature should report on expirations

[Daniel Kahn Gillmor]

Package: libgnupg-interface-perl

GnuPG::Signature reports the time that a given signature was created,
but does not provide information about when the signature is scheduled
to expire.  Not all signatures have expiration dates, but those that do,
it's a pretty relevant piece of information ;)

 http://tools.ietf.org/html/rfc4880#section-5.2.3.10

The attached patch adds support for signature expiration, and
standardizes/clarifies what the expiration should look like (undef) in
the event that there is no expiration for a key or a signature.

	--dkg
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