Update c3.js and c3.min.js

c3.js

@@ -3454,25 +3454,57 @@
         }
         
         function buildPath(points){
-            var path = '';
+            var path = create('path');
+            var d = '';
             for(var i = 0; i<points.length; i++){
-                path += (points[i].action || 'L') + pt(points[i]);
+                d += (points[i].action || 'L') + pt(points[i]);
             }
+            path.attr('d', d);
             return path;
         }
         
+        var serifThickness = 3;
+        
         return {
+            asterisk: function(size, color){
+                size /= 2;
+                return buildPath([
+                    { action: 'M', x: size, y: size },
+                    { action: 'L', x: -size, y: -size },
+                    { action: 'M', x: size, y: -size },
+                    { action: 'L', x: -size, y: size },
+                    { action: 'M', x: 0, y: -size },
+                    { action: 'L', x: 0, y: size }
+                ]).style('stroke', color);
+            },
             circle: function(size){
                 return create('circle').attr('r', size/2);
             },
+            cross: function(size, color){
+                size /= 2;
+                return buildPath([
+                    { action: 'M', x: size, y: size },
+                    { action: 'L', x: -size, y: -size },
+                    { action: 'M', x: size, y: -size },
+                    { action: 'L', x: -size, y: size }
+                ]).style('stroke', color);
+            },
+            plus: function(size, color){
+                size /= 2;
+                return buildPath([
+                    { action: 'M', x: 0, y: size },
+                    { action: 'L', x: 0, y: -size },
+                    { action: 'M', x: size, y: 0 },
+                    { action: 'L', x: -size, y: 0 }
+                ]).style('stroke', color);
+            },
             rhombus: function(size){
-                var marker = create('path');
                 // height/width ratio
                 var ratio = 1;
                 
                 size /= 2;
                 
-                var path = buildPath([
+                var marker = buildPath([
                     { action: 'M', x: 0,           y: size },
                     { action: 'L', x: size/ratio,  y: 0 },
                     { action: 'L', x: 0,           y: -size },
@@ -3480,19 +3512,46 @@
                     { action: 'Z' }
                 ]);
                 
-                marker.attr('d', path)
-                      .style('stroke', 'none');
+                marker.style('stroke', 'none');
                 
                 return marker;
             },
+            serif: function(size){
+                var marker = create('rect');
+                marker.attr('width', size)
+                      .attr('height', serifThickness)
+                      .attr('x', -size/2)
+                      .attr('y', -serifThickness/2)
+                      .style('shape-rendering', 'crispEdges');
+                return marker;
+            },
+            serifRight: function(size){
+                var marker = create('rect');
+                marker.attr('width', size/2)
+                      .attr('height', serifThickness)
+                      .attr('x', 0)
+                      .attr('y', -serifThickness/2)
+                      .style('shape-rendering', 'crispEdges');
+                return marker;
+            },
             square: function(size){
                 var marker = create('rect');
                 marker.attr('width', size)
                       .attr('height', size)
                       .attr('x', -size/2)
-                      .attr('y', -size/2);
+                      .attr('y', -size/2)
+                      .style('shape-rendering', 'crispEdges');
               
                 return marker;
+            },
+            triangle: function(size){
+                size /= 2;
+                return buildPath([
+                    { action: 'M', x: 0, y: -size },
+                    { action: 'L', x: size, y: size },
+                    { action: 'L', x: -size, y: size },
+                    { action: 'Z' }
+                ]).style('stroke', 'none');
             }
         };
     })();
@@ -3504,9 +3563,10 @@
             return marker_fn.circle($$.pointR(d, i)).node();
         }
 
-        return marker_fn[$$.config.marker_types[d.id]]($$.pointR(d, i), $$.color(d, i)).node();
+        var func = marker_fn[$$.config.marker_types[d.id]];
+        
+        return func($$.pointR(d, i), $$.color(d, i)).node();
     };
-
     c3_chart_internal_fn.initBar = function () {
         var $$ = this;
         $$.main.select('.' + CLASS.chart).append("g")