Pyramid-services

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- When using ``request.find_service`` during or before traversal the
``request.context`` is not valid. In these situations the ``context``
parameter will default to ``None`` instead of raising an exception.
See https://github.com/mmerickel/pyramid_services/pull/8

- Add ``config.find_service_factory`` and ``request.find_service_factory``.
See https://github.com/mmerickel/pyramid_services/pull/4

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- Change ``find_service(..., context=None)`` to use a context of ``None``.
Previously this would fallback to using ``request.context`` if the
``context`` was ``None``. Now ``find_service`` will only fallback to
``request.context`` when no ``context`` argument is specified.
See https://github.com/mmerickel/pyramid_services/pull/3

- Support ``introspectable`` for services so that they show up in the
pyramid_debugtoolbar and elsewhere.
See https://github.com/mmerickel/pyramid_services/pull/2

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- Support for ``request.find_service``, ``config.register_service``, and
``config.register_service_factory``.
- Initial commits.