Fix deprecation and formatting warnings#187

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murrayrm merged 10 commits intopython-control:masterfrom

murrayrm:fix_warnings-15jan08

Feb 5, 2018

Commits on Jan 13, 2018

Merge branch 'master' of https://github.com/python-control/python-control
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Commits on Jan 15, 2018

Merge branch 'master' of https://github.com/python-control/python-control
murrayrm
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DOC: use double backlash for math in docstrings
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add unique label to subplots to avoid matplotlib<=2.1 bug (+ deprecation warning)
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