Python 3.6 compatibility. #10

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phn wants to merge 7 commits intohplgit:masterfrom

Commits on Mar 3, 2017

Porting to PY36: run import odespy
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Commits on Mar 4, 2017

Py36: tests can be run; but there are failures.
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Commits on Mar 6, 2017

Tox for running tests.
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Commits on Mar 8, 2017

Commits on Apr 9, 2017

Typos in CHANGES_FOR_PY36.md
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