Implements multiple, stacked plots with brushing. This extends the example at /mbostock/1667367 and allows for multiple panels where each subsequent panel zooms from the previous. Data points are also smoothed, permitting data with over 100,000 points to have an overview with subsequent telescoping while maintaining context.
forked from tommct's block: D3 Stacked Brush Plots
Modified http://d3js.org/d3.v3.min.js to a secure url
https://d3js.org/d3.v3.min.js