code: function exports(_selection) {
              _selection.each(function(_data){
                  chartWidth = width - margin.left - margin.right;
                  chartHeight = height - margin.top - margin.bottom;
                  data = _data;
  
                  buildSVG(this);
              });
          }
docs: This function creates the graph using the selection as container
  @param {D3Selection} _selection A d3 selection that represents
  the container(s) where the chart(s) will be rendered
  @param {Object} _data The data to attach and generate the chart