Update evalfr() to be consistent with MATLAB usage#179

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murrayrm:update_evalfr

Jan 13, 2018

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Merge branch 'master' of https://github.com/python-control/python-control
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Commits on Jan 5, 2018

Merge branch 'master' of https://github.com/python-control/python-control
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Commits on Jan 6, 2018

Update evalfr usage for consistency with MATLAB
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