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Support vector tile source for additional viz types (#120)

* Update text-size to use expression based on viz.label_size property

* Add new label properties to choropleth viz templates

* Move label properties to base class (leverage inheritance to reduce repeated arguments)

* Extract vector_color_map and numeric map (for height or line_width) to a VectorMixin class; fixes linestring bug with interpolation of color for certain color lookups with match-type

* Extend CircleViz with VectorMixin (start GraduatedCircleViz, HeatmapViz, ClusteredCircleViz)

* Extend vector data loading to base map and CircleMap -- datadriven styling for radius needs work

* Refine color mapping in VectorMixin and update templates, viz.py

* Update CircleViz template files with Jinja inheritance, establish {% block circle %} tag

* Update Vector layer example for CircleViz; add geojson_file_to_dict utility and logic to viz.py to facilitate loading data from JSON object, list of Python dicts, GeoJSON filename

* Refine function for parsing GeoJSON and JSON input (esp for vector visualizations) and add SourceDataError

* Add support for GraduatedCircleViz template to use vector source data layer

* Add support for HeatmapViz to use vector data source

* Add and refine tests; update utility name for geojson_to_dict etc.

* Change FileNotFoundError to IOError for Python2.7 support

* Enable data from vector layers to be used for data-driven style (without using data-join technique)

* Update docs for VectorMixin class, vector properties and label properties inherited from MapViz parent class

* Update geojson_to_dict to geojson_to_dict_list and add docs; organize MapBox.create_html()

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