--
* implementing Keyring methods:
- Keyring.getKeys: has an additional option that retrieves the armor
and secret state once at the beginning. This is power hungry, but
allows for Keys to be used directly (without querying gpgme-json
each call)
* permittedOperations.js: reflect recent changes in the native
counterpart, adding more options
* Key: adding two methods for retrieving the armored Key block and
for finding out if the Key includes a secret subkey.
