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This PR adds a a contour-density series based on d3-contour. It acts a much improved version of the heatmap series. The example is a slightly different version of Bostock's Old faithful (https://bl.ocks.org/mbostock/e3f4376d54e02d5d43ae32a7cf0e6aa9). Open to API suggestions and comments!
In the near future it could also get a canvas mode pretty easily. Still to do
This Address #419