Humanfriendly

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Made it possible to use spinners as context managers.

.. _Release 1.19: https://github.com/xolox/python-humanfriendly/compare/1.18...1.19

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Added a ``Spinner.sleep()`` method.

.. _Release 1.18: https://github.com/xolox/python-humanfriendly/compare/1.17...1.18

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- Improved interaction between spinner & verbose log outputs: The spinner until
now didn't end each string of output with a carriage return because then the
text cursor would jump to the start of the screen line and disturb the
spinner, however verbose log output and the spinner don't interact well
because of this, so I've decided to hide the text cursor while the spinner is
active.
- Added another example to the documentation of ``parse_date()``.

.. _Release 1.17: https://github.com/xolox/python-humanfriendly/compare/1.16...1.17

----------------------------

- Change spinners to use the 'Erase in Line' ANSI escape code to properly clear screen lines.
- Improve performance of Travis CI and increase multiprocessing test coverage.

.. _Release 1.16: https://github.com/xolox/python-humanfriendly/compare/1.15...1.16

----------------------------

- Added support for ``AutomaticSpinner`` that animates without requiring ``step()`` calls.
- Changed the Python package layout so that all ``*.py`` files are in one directory.
- Added tests for ``parse_path()`` and ``Timer.rounded``.

.. _Release 1.15: https://github.com/xolox/python-humanfriendly/compare/1.14...1.15

----------------------------

- Changed ``coerce_boolean()`` to coerce empty strings to ``False``.
- Added ``parse_path()`` function (a simple combination of standard library functions that I've repeated numerous times).

.. _Release 1.14: https://github.com/xolox/python-humanfriendly/compare/1.13...1.14