function exports(_selection) {
            _selection.each(function(_data) {
                chartWidth = width - margin.left - margin.right;
                chartHeight = height - margin.top - margin.bottom;
                data = cleanData(_data);

                if (hasTitle()) {
                    chartWidth -= legendSpacing;
                }

                buildScales();
                buildSVG(this);
                buildAxis();
                drawBullet();
                drawTitles();
                drawAxis();

            });
        }
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 {BulletChartData} _data   The data to attach and generate the chart