Merge remote-tracking branch 'itay/feature/fix-linebar-chart-tooltip'

src/models/linePlusBarChart.js

@@ -108,7 +108,8 @@ nv.models.linePlusBarChart = function() {
 
         g.select('.legendWrap')
             .datum(data.map(function(series) { 
-              series.key = series.key + (series.bar ? ' (left axis)' : ' (right axis)');
+              series.originalKey = series.originalKey === undefined ? series.key : series.originalKey;
+              series.key = series.originalKey + (series.bar ? ' (left axis)' : ' (right axis)');
               return series;
             }))
           .call(legend);