- partially reimplemented PGPKeyring - #80
 - fixed a typo in UserID packet regex that was causing it to capture well-formatted comments as part of the name
 - changed _signature fields for PGPKey and PGPUID to deques
 - moved is_ascii and is_path into FileLoader as staticmethods
 - fixed comment0 header in pubtest.asc
 - changed Fingerprint.__hash__ to return the hash of the fingerprint without any spaces
 - partially added first unit test for PGPKeyring