renamed Repo.Release to Repo.Dist because that is more semantically correct for this model
since everything for ReleaseSignature is being done by PGPSignature, it made more sense to run these tests on that class
PEP8
stubbed out the beginnings of debutils.pgp.key
will be testing PGP parsing against pgpdump
comment
moved RFC 4880 comment on computing signatures here
fixed regex
these ought not be here at all
improved fixture structure; added fixture for pgpdump output