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Merge branch 'master' of github.com:mitchellrj/python-pgp

Conflicts:
	pgp/transferrable_keys.py
Merge branch 'master' of github.com:mitchellrj/python-pgp

Conflicts:
	pgp/signature.py
	pgp/transferrable_keys.py
	pgp/utils.py
Key merge revamp WIP.
Fix serialization of partial body lengths.
Fix subpacket content.
Set target for embedded signatures.
Revocation check improvements.
Enlistify generator.
Self-signature enumeration fix.
Key property fixes.