Zope.schema

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- Automate build of Sphinx HTML docs and running doctest snippets via tox.

- Drop explicit support for Python 3.1.

- Introduce NativeString and NativeStringLine which are equal to Bytes and
BytesLine on Python 2 and Text and TextLine on Python 3.

- Change IURI from a Bytes string to a "native" string. This is a backwards
incompatibility which only affects Python 3.

- Bring unit test coverage to 100%.

- Move doctests from the package and wired up as normal Sphinx documentation.

- Add explicit support for PyPy.

- Add support for continuous integration using ``tox`` and ``jenkins``.

- Drop the external ``six`` dependency in favor of a much-trimmed
``zope.schema._compat`` module.

- Ensure tests pass when run under ``nose``.

- Add ``setup.py dev`` alias (runs ``setup.py develop`` plus installs
``nose`` and ``coverage``).

- Add ``setup.py docs`` alias (installs ``Sphinx`` and dependencies).

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- Remove trailing slash in MANIFEST.in, it causes Winbot to crash.

==================

- Add TreeVocabulary for nested tree-like vocabularies.

- Fix broken Object field validation where the schema contains a Choice with
ICountextSourceBinder source. In this case the vocabulary was not iterable
because the field was not bound and the source binder didn't return the
real vocabulary. Added simple test for IContextSourceBinder validation. But a
test with an Object field with a schema using a Choice with
IContextSourceBinder is still missing.

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- Fix bug in ``fromUnicode`` method of ``DottedName`` which would fail
validation on being given unicode. Introduced in 4.0.0.

==================

- Fix deprecated unittest methods.

- Port to Python 3. This adds a dependency on six and removes support for
Python 2.5.

==================

- Fix broken Object field validation. Previous version was using a volatile
property on object field values which ends in a ForbiddenAttribute error
on security proxied objects.