Saving progress
Add pgcrypto functions
Use functions to define the encryption method
Refactor `pgcrypto_fields.functions` for encrypt/decrypt SQL.
Move import to top of the file
Add missing module
One more mistake
Make PGP_PUB, PGP_SYM, DIGEST and HMAC classes attributes
Update docstring
Refactor aggregates classes
Update docstring
Merge pull request #7 from incuna/add-other-encryptions

Add other cryptographic funtions from pgcrypto