In historicalBar, changin d3.transition() to bars.transition().

src/models/historicalBar.js

@@ -170,8 +170,7 @@ nv.models.historicalBar = function() {
           .attr('width', (availableWidth / data[0].values.length) * .9 )
 
 
-      d3.transition(bars)
+      bars.transition().
-          //.attr('y', function(d,i) {  return y(Math.max(0, getY(d,i))) })
           .attr('y', function(d,i) {
             return getY(d,i) < 0 ?
                     y(0) :
@@ -180,7 +179,6 @@ nv.models.historicalBar = function() {
                       y(getY(d,i))
           })
           .attr('height', function(d,i) { return Math.max(Math.abs(y(getY(d,i)) - y(0)),1) });
-          //.order();  // not sure if this makes any sense for this model
 
     });