Adding option for bullet chart to change padding of internal target

src/chart-bullet.js

@@ -91,17 +91,24 @@
                 Math.round(this.canvasHeight * 0.4) - 1, color, color);
         },
 
-        renderTarget: function (highlight) {
-            var targetval = this.values[0],
-                x = Math.round(this.canvasWidth * ((targetval - this.min) / this.range) - (this.options.get('targetWidth') / 2)),
-                targettop = Math.round(this.canvasHeight * 0.10),
-                targetheight = this.canvasHeight - (targettop * 2),
-                color = this.options.get('targetColor');
-            if (highlight) {
-                color = this.calcHighlightColor(color, this.options);
-            }
-            return this.target.drawRect(x, targettop, this.options.get('targetWidth') - 1, targetheight - 1, color, color);
-        },
+	      renderTarget: function (highlight) {
+	        var targetval = this.values[0],
+	          x = Math.round(this.canvasWidth * ((targetval - this.min) / this.range) - (this.options.get('targetWidth') / 2)),
+	          color = this.options.get('targetColor');
+	        if (highlight) {
+	          color = this.calcHighlightColor(color, this.options);
+	        }
+
+	        var targettop = Math.round(this.canvasHeight * 0.10)
+
+	        if(this.options.get('targetVerticalPadding') != null){
+	          targettop = this.options.get('targetVerticalPadding');
+	        }
+
+	        var targetheight = this.canvasHeight - (targettop * 2)
+
+	        return this.target.drawRect(x, targettop, this.options.get('targetWidth') - 1, targetheight - 1, color, color);
+	      },
 
         render: function () {
             var vlen = this.values.length,

src/defaults.js

@@ -89,6 +89,7 @@
             bullet: {
                 targetColor: '#f33',
                 targetWidth: 3, // width of the target bar in pixels
+                targetVerticalPadding: null,
                 performanceColor: '#33f',
                 rangeColors: ['#d3dafe', '#a8b6ff', '#7f94ff'],
                 base: undefined, // set this to a number to change the base start number

src/header.js

@@ -164,6 +164,7 @@
 *       options:
 *       targetColor - The color of the vertical target marker
 *       targetWidth - The width of the target marker in pixels
+*       targetVerticalPadding - The top and bottom padding of the target marker in pixels
 *       performanceColor - The color of the performance measure horizontal bar
 *       rangeColors - Colors to use for each qualitative range background color
 *