gistfile1.js

        var label_group = d3.select(selector + ' .label_group');
        label_group.selectAll("text").remove();
        label_group.selectAll("text")
            .data(pie(Object.keys(data.status)))
          .enter().append("svg:text")
            .attr("dy", "1em")
            .attr("dx", "0.5em")
            .style("fill", "white")
            .style("font", "bold 1.10em Arial")
            .style("kerning", "1")
            .style("letter-spacing", "2");

        var label_text = label_group.append("textPath")
            .attr("xlink:href", function(d, i) { return "#path" + i; });
        label_text.append("svg:tspan")
            .text(function(d) { return d.data; });
        label_text.append("svg:tspan")
            .text(function(d) { return "testing"; });