python bindings: core key import
* The foundation of a pythonic key import function authored by Jacob Adams. * A unit testing script for the same function originally authored by Tobias Mueller * Added DCO reference for Jacob Adams to the GPGME AUTHORS file. * Additional details regarding this patch are available here: https://dev.gnupg.org/T4001
- Signed-off-by: Ben McGinnes <ben@adversary.org>