Now that we have the gnarly '__getattribute__', we *can* tell that lie.

Python 2.7 adds B&D checks which break for the C wrapper.

This version passes all tests except the one which asserts that the proxy
can lie about its '__class__', which can't be done in Python.

Move narrative doctests out to Sphinx.

Convert non-narrative doctestss to unittests.

Move doctest examples to API reference.

Installs 'Sphinx' and dependencies.

Runs 'setup.py develop' plus installs 'nose' and 'coverage'.

Replace deprecated 'zope.interface.implements' usage with equivalent
'zope.interface.implementer' decorator.