Modification to dc.leaflet.js to a) plot colorscale in choropleth in the right order and b) to accept colorbrewer.js scales

my-dc.leaflet.js

dc.leafletChoroplethChart = function(parent, chartGroup) {
  var _chart = dc.colorChart(dc.leafletChart({}));  
  var _geojsonLayer = false;
  var _dataMap = [];

  var _geojson = false;
  var _renderPopup = true;
  var _brushOn = true;
  var _featureOptions = {
    'fillColor':'black', 
    'color':'gray', 
    'opacity':0.4, 
    'fillOpacity':0.6, 
    'weight':1    
  };
  var _renderTitle = true;

  //-----------------katiRG edits--------------------
  var colorPalette = colorbrewer.YlGn[7]; //default: d3.scale.category20c().range();

  //modified to accept minmaxValue which is previously calculated in the choro chart
  var _colorCalculator = function(value, minmaxValue) { 
    //orig code:
    // var domain = _colorDomain;
    // if (typeof _colorDomain === 'function')
    //   domain = _colorDomain.call(_chart);
    // var minValue = domain[0];
    // var maxValue = domain[1];
    
    var minValue = minmaxValue[0];
    var maxValue = minmaxValue[1];    

   //  What is this? maybe can put back in:
   //  if (isNaN(value)) value = 0;
   //  if (!dc.utils.isNumber(maxValue)) return _colors(value);

      //var colorsLength = _chart.colors().range().length; //orig
      var colorsLength = colorPalette.length;                
      var denominator = (maxValue - minValue) / colorsLength;  
      var colorValue = Math.abs(Math.min(colorsLength - 1, Math.round((value - minValue) / denominator)));
      
      // return _chart.colors()(colorValue); //orig
      return colorPalette[colorValue];
  };

 var _colorAccessor = function(d, i){return i;};

  _chart.getColor = function(d, i){    
    //return _colorCalculator(_colorAccessor(d, i)); //orig
    //Pass in _chart.colorDomain(), the min and max value previously calculated in the choro chart:
    return _colorCalculator(_colorAccessor(d, i), _chart.colorDomain());
  };  

  _chart.colorAccessor = function(_){
    if(!arguments.length) return _colorAccessor;
      _colorAccessor = _;
    return _chart;
  };

  //-----------------end katiRG edits--------------------