Added donut chart functionality via new axes.pie parameter#10944

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AlexCav wants to merge 3 commits intomatplotlib:masterfrom

AlexCav:donut-feature

Commits on Apr 1, 2018

Added a 'donut' flag to axes.pie creation, allows for creation of donut charts
AlexCav
committed
Tested PEP8, and rephrased some boolean jargon
AlexCav
committed

Commits on Apr 2, 2018

added donut_chart.rst to the next_whats_new folder
AlexCav
committed