Py-context

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* Added support for ``*args``, ``**kwargs`` in ``Context.push()``.
* Added ``__dir__`` support.

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* Added signals support - ``context_initialized``, ``pre_context_changed``,
``post_context_changed`` and ``context_key_changed``. See README for examples.

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* Excluding tests from being installed

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* Add attribute support
* Add make watch target

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* First release on PyPI.