fix bug in AChartEngine's legend, where the sample line didn't pick up its series's Stroke setting

LineChart.java

/*
AChartEngine has a bug. In a Series, such as an XYSeries or TimeSeries, if you set a Stroke,
such as myXYRenderer.setStroke(BasicStroke.DASHED), the line appears dashed. But the sample line
down in the legend, while the correct color, is not dashed.

The fix is to get into LineChart.java and make drawLegendShape() look a little bit like this:
*/

  public void drawLegendShape(Canvas canvas, SimpleSeriesRenderer renderer, float x, float y,
      int seriesIndex, Paint paint) {
    float oldWidth = paint.getStrokeWidth();
    float lineWidth = ((XYSeriesRenderer) renderer).getLineWidth();
    PathEffect formerEffect = paint.getPathEffect();

    if (lineWidth > 0.0) {
      paint.setStrokeWidth(lineWidth);
      BasicStroke stroke = renderer.getStroke();
      if (stroke == null)
        stroke = BasicStroke.SOLID;

      PathEffect effect = null;
      if (stroke.getIntervals() != null) {
        effect = new DashPathEffect(stroke.getIntervals(), stroke.getPhase());
      }
      paint.setStrokeCap(stroke.getCap());
      paint.setStrokeJoin(stroke.getJoin());
      paint.setStrokeMiter(stroke.getMiter());
      paint.setPathEffect(effect);
      paint.setStyle(Style.FILL_AND_STROKE);

      canvas.drawLine(x, y, x + SHAPE_WIDTH, y, paint);
    }

    paint.setStrokeWidth(oldWidth);
    if (isRenderPoints(renderer)) {
      pointsChart.drawLegendShape(canvas, renderer, x + 5, y, seriesIndex, paint);
    }
    paint.setPathEffect(formerEffect);
  }