anchor.diff:      var h = d.score;
       // breakdown
       t.selectAll(".contributor")
  -      .attr("transform", "translate(0,"+y(h)+")");
  +      .attr("transform", "translate(0," + y(h) + ")");
       t.selectAll(".contributor-bar")
         .attr("height", 0);
       // label
  
positive.code:     // breakdown
      t.selectAll(".contributor")
        .attr("transform", function(d) {
          return "translate(0,"+(y(d.y0))+")";
        });
      t.selectAll(".contributor-bar")
        .attr("height", function(d) { return y(d.score); });
  
negative.code: contributor_groups
    .append("text")
    .attr("class", "contributor-name")
    .attr("x", x.rangeBand() / 2)
    .attr("y", "1em")
    .text(function(d) { return d.github_name; });
  
  