Zope-contentprovider

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- Since ``tales:expressiontype`` is now in ``zope.browserpage``, update
conditional ZCML accordingly so it doesn't depend on the presence of
``zope.app.pagetemplate`` anymore.

==================

- Ensure that our ``configure.zcml`` can be loaded without requiring further
dependencies. It uses a ``tales:expressiontype`` directive defined in
``zope.app.pagetemplate.`` We keep that dependency optional, as not all
consumers of this package use ZCML to configure the expression type.

==================

- Update test dependency to use ``zope.browserpage``.

==================

- Add very simple, but useful base class for implementing content
providers, see ``zope.contentprovider.provider.ContentProviderBase``.

- Remove unneeded testing dependencies. We only need ``zope.testing`` and
``zope.app.pagetemplate``.

- Remove zcml slug and old zpkg-related files.

- Add setuptools dependency to setup.py.

- Clean up package's description and documentation a bit. Remove
duplicate text in README.

- Change mailing list address to zope-dev at zope.org instead of
retired one.

- Change ``cheeseshop`` to ``pypi`` in the package url.

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- Initial release independent of the main Zope tree.