Executor

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Fixed ``__version__`` variable corruption introduced in 1.7 :-S.

.. _Release 1.7.1: https://github.com/xolox/python-executor/compare/1.7...1.7.1

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Make it possible to provide overrides for environment variables (`1`_).

.. _Release 1.7: https://github.com/xolox/python-executor/compare/1.6.2...1.7
.. _1: https://github.com/xolox/python-executor/issues/1

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- Stop mixing SH and Bash usage (consistently use Bash everywhere).
- Documented that the encoding option is used for input and output
- Added ``tox.ini`` for easy testing and execute ``tox`` using ``make test``.

.. _Release 1.6.2: https://github.com/xolox/python-executor/compare/1.6.1...1.6.2

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Bug fix: Properly close open file handle to ``/dev/null``.

This fixes the following warning emitted by Python 3.4::

ResourceWarning: unclosed file <_io.BufferedWriter name='/dev/null'>

.. _Release 1.6.1: https://github.com/xolox/python-executor/compare/1.6...1.6.1

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Expose ``pipes.quote()`` wrapping logic as ``executor.quote()``.

.. _Release 1.6: https://github.com/xolox/python-executor/compare/1.5...1.6

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Added support for ``execute(..., silent=True)`` which silences the standard
output and error streams.

.. _Release 1.5: https://github.com/xolox/python-executor/compare/1.4...1.5