remove plotly/colors.py in favour of utils#1279

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Kully wants to merge 23 commits intomasterfrom

colors-functions-organized

Commits on Nov 20, 2018

copy n_colors from colors to utils - update all references to colors.n_colors to utils
Kully
committed
copy good PLOTLY_SCALES in colors.py to incorrect one in utils ; redirect all PLOTLY_SCALES = {
Kully
committed

Commits on Nov 21, 2018

fix utils.validate_colors so that plotly colors do not give error
Kully
committed

Commits on Nov 22, 2018

Commits on Dec 10, 2018