Merge pull request #116 from kmels/develop

Adds Chart getter to XChartPanel. 

xchart/src/main/java/org/knowm/xchart/XChartPanel.java

@@ -93,6 +93,10 @@ public class XChartPanel extends JPanel {
     g2d.dispose();
   }
 
+  public Chart getChart() {
+    return this.chart;
+  }
+
   @Override
   public Dimension getPreferredSize() {
 
@@ -308,4 +312,4 @@ public class XChartPanel extends JPanel {
 
     return series;
   }
-}
+}
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