added a feature list/road map
can now load ASCII armored public and secret keys, so removed this TODO comment
moved KeyAlgo to fields; renamed to PubKeyAlgo
moved HashAlgo to fields
added new PFIntEnums: SymmetricKeyAlgo, CompressionAlgo.
added new header tags
added new subpacket types
added new classes to parse Public Keys, Public Subkey, Secret Keys, Secret Subkey, and User ID packets; completed Signature.Type enum
added __bytes__ shortcut method
additional test material
commented out the keyrings; these may need to move later.