Development: Crypto

The test keys used for testing the crypto suite expires after one year, to regenerate:

0. Set the GNUPGHOME environment variable to: /full/path/test/gnupg_test_home/
1. Generate receiver keys for email: [email protected] (no password)
2. Export key
3. Move keyrings to receiver_*.gpg
4. Generate sender keys for email: [email protected] (no password)
5. Import receiver key and 'trust' it.
6. Update test/gnupg_test_home/gpg.conf with deafult-key to represent the new sender key.

Check PR55 for more information.