Timezonefinder

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* clarification of readme: referenced latest `timezonefinderL` release, better rst headlines, updated shield.io banner syntax
* clarification of speedup times (exponential notation)
* removed `six` and py2 dependency from tests
* minor updates to publishing routine
* minor improvement in timezone_at(): conversion coordinates to int later only when required

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* updated the data to `2019a <https://github.com/evansiroky/timezone-boundary-builder/releases/tag/2019a>`__

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* BUGFIX: fixing 77 (missing dependency in setup.py)

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* ATTENTION: Dropped Python2 support (72)! `six` dependency no longer required.
* BUGFIX: fixing 74 (broken py3 with numba support)
* added `in_memory`-mode (adapted unit tests to test both modes, added speed tests and explanation to readme)
* use of timeit in speed tests for more accurate results
* dropped use of kwargs_only decorator (can be implemented directly with python3)

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* BUGFIX: fixing 70 (broken py2.7 with numba support)
* added automatic tox tests for py2.7 py3 environments with numba installed
* fixed coverage report

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* added test cases for the Numba helpers (55)
* added more polygon tests to test the function inside_polygon()
* added global data type definitions (format strings) to ``global_settings.py``
* removed tzwhere completely from the main tests (no comparison any more).
* removed code drafts for ahead of time compilation (40)