Humanfriendly

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- Fixed `issue 7`_ (``TypeError`` when calling ``show_pager()`` on Python 3) and added a test.
- Minor improvements to the ``setup.py`` script.
- Stop testing tags on Travis CI.

.. _Release 1.44.8: https://github.com/xolox/python-humanfriendly/compare/1.44.7...1.44.8
.. _issue 7: https://github.com/xolox/python-humanfriendly/issues/7

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Minor improvements to usage message reformatting.

.. _Release 1.44.7: https://github.com/xolox/python-humanfriendly/compare/1.44.6...1.44.7

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Remove an undocumented ``.strip()`` call from ``join_lines()``.

Why I noticed this: It has the potential to eat significant white
space in usage messages that are marked up in reStructuredText syntax.

Why I decided to change it: The behavior isn't documented and on
second thought I wouldn't expect a function called ``join_lines()``
to strip any and all leading/trailing white space.

.. _Release 1.44.6: https://github.com/xolox/python-humanfriendly/compare/1.44.5...1.44.6

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Improved the usage message parsing algorithm (also added a proper test). Refer
to ``test_parse_usage_tricky()`` for an example of a usage message that is now
parsed correctly but would previously confuse the dumb "parsing" algorithm in
``parse_usage()``.

.. _Release 1.44.5: https://github.com/xolox/python-humanfriendly/compare/1.44.4...1.44.5

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

Made usage message parsing a bit more strict. Admittedly this still needs a lot
more love to make it more robust but I lack the time to implement this at the
moment. Some day soon! :-)

.. _Release 1.44.4: https://github.com/xolox/python-humanfriendly/compare/1.44.3...1.44.4

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

Unbreak conditional importlib dependency after breakage observed here:
https://travis-ci.org/xolox/python-humanfriendly/builds/110585766

.. _Release 1.44.3: https://github.com/xolox/python-humanfriendly/compare/1.44.2...1.44.3