Zope-proxy

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- Add support for Python 3.4.

- Update ``bootstrap.py`` to version 2.2.

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- Fix interface object introspection in PyPy. For some reason PyPy makes
attributes available despite the restrictive ``__slots__`` declaration.

- Add a bunch of tests surrounding interface lookup and adaptation.

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- Make ``PyProxyBase.__iter__()`` return the result of
``PyProxyBase._wrapped.__iter__`` if available, otherwise falling back to
Python internals. The previous implementation always created a generator.

- In ``PyProxyBase.__setattr__()``, allow setting of properties on the
proxy itself. This is needed to properly allow proxy extensions as was
evidenced int he ``zope.security.decorator`` module.

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- Fleshed out PyPI Trove classifiers.

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- Enable compilation of dependent modules under Py3k.

- Replace use of ``PyCObject`` APIs with equivalent ``PyCapsule`` APIs,
except under Python 2.6.

N.B. This change is an ABI incompatibility under Python 2.7:
extensions built under Python 2.7 against 4.0.x versions of
``zope.proxy`` must be rebuilt.

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- Add support for Python 3.3.