Pycp

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* Packaging fixes

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* Fix calling ``--version`` is some corner cases.

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* New feature: colors by default.

I'd like to thank schvabodka-man for giving me the opportunity to
refactor code that was more than 7 years old :)

* Breaking change: remove ``--all`` see `19 <https://github.com/dmerejkowsky/pycp/issues/19>`_
for details.
* Drop Windows support
* Drop Python2 support
* Massive refactoring
* Stricter CI

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* Try to preserve user and group when used with ``-p,--preserve``
* Optimization : read source file size only once
* Fix crash when file size increases while it's being copied

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* Include test/test_dir/ in source package. This
makes it possible for pycp packages to run the tests

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* Fix README. (version bump required for updating
pypi page)