code: function exports(_selection) {
              _selection.each(function(_data){
                  chartWidth = width - margin.left - margin.right;
                  chartHeight = height - margin.top - margin.bottom;
                  data = cleanData(_data);
  
                  buildScales();
                  buildSVG(this);
                  createGradients();
                  createMaskingClip();
                  drawArea();
                  drawLine();
                  drawEndMarker();
  
                  if (titleText) {
                      drawSparklineTitle();
                  }
              });
          }
docs: This function creates the graph using the selection and data provided
  
  @param {D3Selection} _selection A d3 selection that represents
  the container(s) where the chart(s) will be rendered
  @param {SparklineChartData} _data The data to attach and generate the chart