reporting: @graph: add shade_color option

matlab/reports/@graph/createGraph.m

@@ -87,7 +87,7 @@ if ~isempty(o.shade)
     % From ShadePlotForEmpahsis (Matlab Exchange)
     % use patch bc area doesn't work with matlab2tikz
     sh = patch([repmat(x1, 1, 2) repmat(x2, 1, 2)], ...
-               [yrange fliplr(yrange)], [0 1 0], ...
+               [yrange fliplr(yrange)], o.shade_color, ...
                'facealpha', o.shade_opacity);
     children =get(gca(), 'children');
     children = [children(2:end); sh];

matlab/reports/@graph/graph.m

@@ -49,6 +49,7 @@ o.xrange = '';
 o.yrange = '';
 
 o.shade = '';
+o.shade_color = [0 1 0];
 o.shade_opacity = .2;
 
 o.grid = true;