sqlalchemy: addition of Encrypted column type
- Adds submodule types inside invenio.ext.sqlalchemy package.
- Refactors the types.py into separate packages.
- Adds of a type named Encrypted that will be used for encrypting and decrypting access_tokens. (PR #2173)
- Adds of pycrypto>=2.6.1 to setup.py.
Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Konstantinos Kostis <konstantinos.kostis@cern.ch>