More-jwtauth

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- Make Cryptography optional.

**Breaking Change:** For using other algorithms than HMAC you now need
to install the ``crypto`` dependencies explicitly. Read the note in the
Requirements section and the new Installation section of README.rst.

- Add an Installation section to the README.
- Refactor the cryptography test suite.

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- Adding some tests.
- Increase coverage to 100%.
- Add travis-ci and tox integration.
- Some clean-up.
- Upgrade to Morepath 0.14.
- Some improvements to the setup and release workflow.

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- Upgrade to Morepath 0.13.2 and update the tests.
- Upgrade PyJWT to 1.3.0 and cryptography to 1.3.1.
- Make it a PyPI package and release it. Fixes Issue 1.

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- Upgrade PyJWT to 1.4.0 and cryptography to 0.9.1.
- Python 3.2 is no longer a supported platform. This version of Python is rarely used.
PyUsers affected by this should upgrade to 3.3+.
- Some cleanup.

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- Integrate the set_jwt_auth_header function into the identity policy as remember method.

- Add support for PS256, PS384, and PS512 algorithms.

- Pass settings directly as arguments to the JWTIdentityPolicy class with the possibility
to override them with Morepath settings using the method introduced in Morepath 0.11.

- Remove JwtApp as now we use JWTIdentityPolicy directly without inherit from JwtApp.

- Add a Introduction and Usage section to README.

- Integrate all functions as methods in the JWTIdentityPolicy Class.

- Refactor the test suite.

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- Initial public release.