Tooltip gets stuck

Despite krispo#172 had been solved in case of changing data, bu it is stil happening when change options. Set the option useInteractiveGuideline true. After populate data, change  the current options like tickFormat. This only happens with useInteractiveGuideline=true.

Author: Alan Lins

src/angular-nvd3.js

@@ -283,6 +283,10 @@
                                 d3.select('#' + scope.chart.tooltip.id()).remove();
                             }
 
+                            if (scope.chart && scope.chart.interactiveLayer && scope.chart.interactiveLayer.tooltip && scope.chart.interactiveLayer.tooltip.id) {
+                                d3.select('#' + scope.chart.interactiveLayer.tooltip.id()).remove();
+                            }
+
                             // To be compatible with old nvd3 (v1.7.1)
                             if (nv.graphs && scope.chart) {
                                 for (var i = nv.graphs.length - 1; i >= 0; i--) {