Zope.interface

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- Fix installation without a C compiler on Python 3.5
(https://github.com/zopefoundation/zope.interface/issues/24).

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- Add support for PyPy3.

- Remove unittest assertions deprecated in Python3.x.

- Add ``zope.interface.document.asReStructuredText``, which formats the
generated text for an interface using ReST double-backtick markers.

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- Add support for Python 3.4.

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

- Add ``named(name)`` declaration, that specifies the component name, so it
does not have to be passed in during registration.

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- Fix a bug where a decorated method caused false positive failures on
``verifyClass()``.

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- Fix a bug that was revealed by porting zope.traversing. During a loop, the
loop body modified a weakref dict causing a ``RuntimeError`` error.