Handle dasharray with odd number of elements by repeating them

- fixes #58

Source/Basic Shapes/SvgVisualElement.cs

@@ -251,6 +251,11 @@ namespace Svg
                             {
                                 if (this.StrokeDashArray != null && this.StrokeDashArray.Count > 0)
                                 {
+                                    if (this.StrokeDashArray.Count % 2 != 0)
+                                    {
+                                        // handle odd dash arrays by repeating them once
+                                        this.StrokeDashArray.AddRange(this.StrokeDashArray);
+                                    }
                                     /* divide by stroke width - GDI behaviour that I don't quite understand yet.*/
                                     pen.DashPattern = this.StrokeDashArray.ConvertAll(u => ((u.ToDeviceValue(renderer, UnitRenderingType.Other, this) <= 0) ? 1 : u.ToDeviceValue(renderer, UnitRenderingType.Other, this)) /
                                         ((strokeWidth <= 0) ? 1 : strokeWidth)).ToArray();

Tests/Svg.UnitTests/PassingTests.csv

@@ -50,6 +50,7 @@ painting-fill-05-b
 painting-stroke-01-t
 painting-stroke-02-t
 painting-stroke-04-t
+painting-stroke-06-t
 painting-stroke-09-t
 painting-stroke-10-t
 paths-data-01-t

Tests/W3CTestSuite/PassingTests.txt

@@ -39,6 +39,7 @@ masking-path-06-b.svg
 masking-path-03-b.svg
 metadata-example-01-t.svg
 painting-control-04-f.svg
+painting-stroke-06-t.svg
 painting-stroke-09-t.svg
 painting-stroke-10-t.svg
 pservers-grad-01-b.svg