Updated charted DEP to 0.4.X

packages/charted/lib/charts/cartesian_renderers/bubble_chart_renderer.dart

 //
 // Copyright 2014 Google Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 //
 
 part of charted.charts;
 
@@ skipping 53 matching lines @@
         yDimensionVals = [];
     for (var row in area.data.rows) {
       xDimensionVals.add(row.elementAt(xDimensionIndex));
       yDimensionVals.add(row.elementAt(yDimensionIndex));
     }
 
     var group = _group.selectAll('.measure-group').data(columns);
     group.enter.append('g')..classed('measure-group');
     group.each((d, i, e) {
       e.style.setProperty('fill', color(i));
-      e.attributes['data-column'] = series.measures.elementAt(i);
+      e.attributes['data-column'] = series.measures.elementAt(i).toString();
     });
     group.exit.remove();
 
     var measures =
         group.selectAll('.bubble').dataWithCallback((d, i, e) => columns[i]);
 
     measures.enter.append('circle')..classed('bubble');
     measures.each((d, i, e) {
       e.attributes
         ..['transform'] = 'translate('
             '${xDimensionScale.scale(xDimensionVals[i])},'
             '${yDimensionScale.scale(yDimensionVals[i])})'
         ..['r'] = '${bubbleRadiusScale.scale(d) * bubbleRadiusFactor}'
-        ..['data-row'] = i;
+        ..['data-row'] = i.toString();
     });
     measures.exit.remove();
     handleStateChanges([]);
   }
 
   @override
   void dispose() {
     if (_group == null) return;
     _group.selectAll('.row-group').remove();
   }
 
   @override
   double get bandInnerPadding => 1.0;
 
   @override
   double get bandOuterPadding =>
       area.theme.getDimensionAxisTheme().axisOuterPadding;
 
   @override
   Extent get extent {
     assert(series != null && area != null);
-    var rows = area.data.rows, max = rows[0][series.measures.first], min = max;
+    var rows = area.data.rows,
+        max = rows.first[series.measures.first],
+        min = max;
 
     rows.forEach((row) {
       series.measures.forEach((idx) {
         if (row[idx] > max) max = row[idx];
         if (row[idx] < min) min = row[idx];
       });
     });
     return new Extent(min, max);
   }
 
@@ skipping 20 matching lines @@
   }
 
   void _event(StreamController controller, data, int index, Element e) {
     if (controller == null) return;
     var rowStr = e.parent.dataset['row'];
     var row = rowStr != null ? int.parse(rowStr) : null;
     controller.add(new DefaultChartEventImpl(
         _scope.event, area, series, row, index, data));
   }
 }