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Add choropleth support (#40)

* Add basic chloropleth support

* Center zoom on click coordinates; rename polygons layer to 'cholorpleth-fill' per PR review comments

* Add line_color, line_stroke, and line_width properties to ChloroplethViz; update url transformRequest function in map init to match implementation in master

* Add chloropleth label layer; add template block for styling legend keys

* Add line styling to example chloropleth notebook

* Update internal documentation in ChloroplethViz class; add chloropleth documentation to docs-markdown/viz.md template

* Update spelling to mapbox standard: 'choropleth'

* Add tests for ChoroplethViz (currently uses polygons.geojson)

* Formatting and headers on choropleth notebook

* Add vector layer support options; requesting direction for reconciling color assignment with data join and Mapboxgl-jupyter color_stops paradigm

* Single ChoroplethViz class defines either vector-based or geojson-based viz templates depending on variables in init

* Add support for categorical data-driven styling with vector data-join; include helper function for interpolating (mapping) colors when using vector-join technique; update docs and example notebook for vector data support in ChoroplethViz

* Attempt to add test for utils.rgb_tuple_from_str

* Additional test coverage for ChoroplethViz and color_map, rgb_tuple_from_str utils

* Per @ryanbaumann 's comments: revert color data-join style to the old Mapboxgl property functions (faster) and add layer-filter

* Test fix

* Minor refactor to color_map to prioritize returning exact match color from color_stops

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