Timezonefinder

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* updated the data to `2018i <https://github.com/evansiroky/timezone-boundary-builder/releases/tag/2018i>`__
* introduced ``global_settings.py`` to globally define settings and get rid of "magic numbers".

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* updated the data to `2018g <https://github.com/evansiroky/timezone-boundary-builder/releases/tag/2018g>`__

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* ATTENTION: the package ``importlib_resources`` is now required
* fixing automatic Conda build by exchanging ``pkg_resources.resource_stream`` with ``importlib_resources.open_binary``
* added tests for overflow in helpers.py/inside_polygon()

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* ATTENTION: the package `kwargs_only <https://github.com/adamchainz/kwargs-only>`__ is not a requirement any more!
* fixing 63 (kwargs_only not in conda) enabling automatic conda forge builds by directly providing the kwargs_only functionality again
* added example.py with the code examples from the readme
* fixing 62 (overflow happening because of using numpy.int32): forcing int64 type conversion

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* fixing typo in requirements.txt
* updated publishing routine: reminder to include all direct dependencies and to compile the requirements.txt with python 2 (pip-tools)

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* ATTENTION: the package `kwargs_only <https://github.com/adamchainz/kwargs-only>`__ is now required! This functionality has previously been implemented by the author directly within this package, but some code features got deprecated.
* updated build/testing/publishing routine
* fixing issue 61 (six dependency not listed in setup.py)
* no more default arguments for timezone_at() and certain_timezone_at()
* no more comparison to (py-)tzwhere in the tests (test_it.py)
* updated requirements.txt (removed tzwhere and dependencies)
* prepared helpers_test.py for also testing helpers_numba.py
* exchanged deprecated inspect.getargspec() into .getfullargspec() in functional.py