Add smart selection of gains for root locus plot. Calculation of break…#132

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gonmolina wants to merge 6 commits intopython-control:masterfrom

gonmolina:smart-rlocus

Commits on Feb 16, 2017

Add smart selection of gains in root locus plot. Calculation of breakpoints of real axis.
gonmolina
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Commits on Feb 17, 2017

Took into account comments made in pull request #132:
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Commits on Feb 18, 2017

Commits on Feb 19, 2017

add zeros to vector of roots when calculation of axis limits it is preformed.
gonmolina
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