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- Add support for Python 3.5 and 3.6.
- Drop support for Python 2.6 and 3.3.
- Deprecate ``zope.site.hooks.*``, ``zope.site.site.setSite``,
``zope.site.next.getNextUtility`` and ``zope.site.next.queryNextUtility``
with ``zope.deprecation``. These will be removed in version 5.0.
They all have replacements in ``zope.component``.
- Reach 100% test coverage and ensure we remain there.