Zope.i18nmessageid

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- Make compilation of C extension optional again; 3.5.1 broke this
inasmuch as this package become unusable on non-CPython platforms.
Making the compilation of the C extension optional again implied
removing ``setup.py`` code added in 3.5.1 which made the C extension
a setuptools "Feature" and readding code from 3.5.0 which overrides
the distutils ``build_ext`` command.

- Move pickle equality tests into a unittest.TestCase test to make it
easier to condition the tests on whether the C extension has been
compiled. This also makes the tests pass on Jython.

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- Remove use of 'zope.testing.doctestunit' in favor of stdlib's 'doctest.

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- LP 257657 / 489529: Fix memory leak in C extension.

- Fix the compilation of the C extension with python 2.6: refactored it as a
setuptools Feature.

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- Make compilation of C extension optional.

- Add support to bootstrap on Jython.

- Change package's mailing list address from zope3-dev at zope.org to
zope-dev at zope.org, because zope3-dev is now retired.

- Reformat change log to common formatting style.

- Update package description and docs a little.

- Remove old .cfg files for zpkg.

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- Make PyPI the home URL.

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- Move the ``ZopeMessageFactory`` from ``zope.app.i18n`` to this package.