Gocept-pseudonymize

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- Bugfix: ``text()`` pseudonymizer now works as expected for texts longer
than 11 bytes. Previously it returned an 11 byte result for longer texts
ignoring the part after the 11th byte (default behavior of the used
``crypt`` implementation). (1296)

- Fixed handling of `Extended crypt` (signalled by starting the salt with an
underscore): Salt is now correctly stripped from result. **Caution:** This
leads to different pseudonymization results when using a secret starting
with underscore than in version 0.3.

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- Fix tests in documentation + testing documentation now.

- Add new pseudonymizers:

- ``datestring()``

- ``day()``

- ``month()``

- ``year()``

- **Caution:** Due to changed implementation of the ``date()`` function it
returns different values than in version 0.2.

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- ``date()`` does not return pseudonymized years smaller than `1900` anymore as
``datetime.date`` can not handle years smaller that `1900`.

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- Initial release.