Fix a bunch of errors in color_brewer and add unit tests
#115
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The non-qualitative schemes should be extendable. This commit adds this feature.
Fixes #104 and #114. Also probably fix python-visualization/folium#1270.
Moreover, the following error was not reported via issues and are fixed:
Noneinstead of a real scheme vector to linear_gradient;nvalue provided tocolor_schemewas a float, it tried to select an unknown scheme without raising the right Exception type.WebDriver.find_element_by_css_selector.