Zope.contentprovider

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- Add support for PyPy and PyPy3.

- Add support for Python 3.4.

- Add support for testing on Travis.

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

- Add Python 3.3 support.

- Replace deprecated ``zope.component.adapts`` usage with equivalent
``zope.component.adapter`` decorator.

- Replace deprecated ``zope.interface.implements`` usage with equivalent
``zope.interface.implementer`` decorator.

- Drop support for Python 2.4 and 2.5.

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- Fix unit tests broken under Python 2.4 by the switch to the standard
library ``doctest`` module.

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- Prefer the standard library's ``doctest`` module to the one from
``zope.testing.``

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

- Since ``tales:expressiontype`` is now in ``zope.browserpage``, update
conditional ZCML accordingly so it doesn't depend on the presence of
``zope.app.pagetemplate`` anymore.

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- Ensure that our ``configure.zcml`` can be loaded without requiring further
dependencies. It uses a ``tales:expressiontype`` directive defined in
``zope.app.pagetemplate.`` We keep that dependency optional, as not all
consumers of this package use ZCML to configure the expression type.