Support for pie charts.

rd_ui/app/scripts/directives.js

@@ -65,7 +65,8 @@
                     'Line': 'line',
                     'Column': 'column',
                     'Area': 'area',
-                    'Scatter': 'scatter'
+                    'Scatter': 'scatter',
+                    'Pie': 'pie'
                 };
 
                 if (!scope.vis) {

rd_ui/app/scripts/ng-highchart.js

@@ -107,6 +107,16 @@
                     }
                 }
             },
+            pie: {
+                allowPointSelect: true,
+                cursor: 'pointer',
+                dataLabels: {
+                    enabled: true,
+                    color: '#000000',
+                    connectorColor: '#000000',
+                    format: '<b>{point.name}</b>: {point.percentage:.1f} %'
+                }
+            },
             scatter: {
                 marker: {
                     radius: 5,