Add 'style' option to group for lineChart.

Allows overriding of class definitions which provides a much simpler interface for programatically setting user defined options.

lib/timeline/component/GraphGroup.js

@@ -71,6 +71,7 @@ GraphGroup.prototype.update = function(group) {
   this.content = group.content || 'graph';
   this.className = group.className || this.className || "graphGroup" + this.groupsUsingDefaultStyles[0] % 10;
   this.visible = group.visible === undefined ? true : group.visible;
+  this.style = group.style;
   this.setOptions(group.options);
 };
 

lib/timeline/component/LineGraph.js

@@ -1047,6 +1047,9 @@ LineGraph.prototype._drawLineGraph = function (dataset, group) {
       var svgHeight = Number(this.svg.style.height.replace("px",""));
       path = DOMutil.getSVGElement('path', this.svgElements, this.svg);
       path.setAttributeNS(null, "class", group.className);
+      if(group.style !== undefined) {
+        path.setAttributeNS(null, "style", group.style);
+      }
 
       // construct path from dataset
       if (group.options.catmullRom.enabled == true) {