Merge pull request #222 from toberndo/subkey_update

Merge subkey binding signatures in key update method
Generate key by default without unlocking secret part. Use options parameter for generate method.
bump version
Allow private keys for verify methods in Cleartext and Message class. Refactor getKeyPacket methods in Key class.
Merge remote-tracking branch 'origin/unify_verify_interface' into firefox_v2_dev