- update to 0.5.1:
* Added ``TRUST_EXPIRED`` to ``trust_keys``. Thanks to Leif Liddy
for the patch.
* Fix #206: Remove deprecated ``--always-trust`` in favour of
``--trust-model always``
* Fix #208: Add ``status_detail`` attribute to result objects which
* is populated when the status is ``'invalid recipient'``
(encryption/decryption) or ``'invalid signer'``
(signing). This attribute will be set when the result object's
``status`` attribute is set to ``invalid recipient`` and will
contain more information about the failure in the form of
``reason:ident`` where ``reason`` is a text description of the
reason, and ``ident`` identifies the recipient key.
* Add ``scan_keys_mem()`` function to scan keys in a string. Thanks
to Sky Moore for the patch.
* Fix #214: Handle multiple signatures when one of them is invalid
or unverified.
* A ``problems`` attribute was added which holds problems reported
by ``gpg`` during verification. This is a list of dictionaries,
one for each reported problem. Each dictionary will have
``status`` and ``keyid`` keys indicating
the problem and the corresponding key; other information in the
dictionaries will be error specific.
* Fix #217: Use machine-readable interface to query the ``gpg``
version.
* Added the ability to export keys to a file.

* Provide the ability to add subkeys.
search_keys() to allow passing options relating to key servers.
* Improved permission-denied test.