Executor

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- Bug fix for obscure ``UnicodeDecodeError`` in ``setup.py`` (on Python 3 only).
- Make Travis CI builds fail when coverage isn't >= 90%.
- Also run the tests under PyPy on Travis CI.

.. _Release 4.4.1: https://github.com/xolox/python-executor/compare/4.4...4.4.1

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Expose the CPU count of execution contexts.

.. _Release 4.4: https://github.com/xolox/python-executor/compare/4.3...4.4

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Give contexts a ``test()`` method.

.. _Release 4.3: https://github.com/xolox/python-executor/compare/4.2...4.3

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Enable context users to prepare commands without starting them.

.. _Release 4.2: https://github.com/xolox/python-executor/compare/4.1...4.2

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Make it possible to nest 'unwind contexts' (``executor.contexts``).

.. _Release 4.1: https://github.com/xolox/python-executor/compare/4.0.1...4.1

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Bug fix for remote working directory logic.

.. _Release 4.0.1: https://github.com/xolox/python-executor/compare/4.0...4.0.1