Fix `pip install lshash` for python3#18

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hobson wants to merge 13 commits intokayzhu:masterfrom

totalgood:master

Commits on Nov 13, 2016

use pyscaffolding to avoid import of lshash to retrieve __version__
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start moving lshash.__init__.__*__ to setup.cfg
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fix license
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add "Extras" for Redis
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restore pypi "Categories" from previous setup.py
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Commits on Nov 14, 2016

some tests
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test_spheres while recording distances
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Commits on Apr 27, 2017

make tests.test_spheres a module
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change name to lshash3
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name lshash3 package lshash
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broke test_spheres.py
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revert test_spheres
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closest, second and tenth
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