Zope2.sessioncookie

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- Add support for (optionally) encrypting session cookies, rather than
signing them.

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- Add an attribute, ``signedsessioncookie_installed``, to the root object
during installation.

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- Fix rendering ``http_only`` cookie attribute.

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- Add support for extra Pyramid session configuration via ZCML:
``hash_algorithm``, ``timeout``, ``reissue_time``.

- Suppress empty / None values in cookie attributes passed to
``ZPublisher.HTTPResponse.setCookie``.

- Refactor install script to allow reuse from other modules.

- Fix compatibility w/ ``zope.configuration 3.7.4``.

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- Initial release.