Merge pull request #26 from nathandao/master

#25 addData support for round charts

Author: jhudson8

lib/core.js

@@ -90,7 +90,11 @@ var updatePoints = function(nextProps, chart, dataKey) {
 
   if (name === 'PolarArea' || name === 'Pie' || name === 'Doughnut') {
     nextProps.data.forEach(function(segment, segmentIndex) {
-      chart.segments[segmentIndex].value = segment.value;
+      if (!chart.segments[segmentIndex]) {
+        chart.addData(segment);
+      } else {
+        chart.segments[segmentIndex].value = segment.value;
+      }
     });
   } else {
     while (chart.scale.xLabels.length > nextProps.data.labels.length) {