Simplecrypto

++++++++++++++++++

- Add base ``Key`` class.
- Introduce ``raw`` versions of encrypt and decrypt.
- Implemented key printing and comparison.

++++++++++++++++++

- Return str from ``to_base64`` and allow ``from_base64`` to receive str.
- Create classes for different key types.
- Change return from ``to_hex`` to str for consistency with base64.
- ``guess_hash`` function moved to different module.
- Automatically use session keys when encrypting large messages.

++++++++++++++++++

- Initial release.