added new graphicName symbolizer property, which allows to render well-known graphic symbols named "square", "cross", "x" and "triangle", in addition to the existing "circle". Thanks Tim for the tweaks and the example. r=tschaub,elemoine (closes #1398)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7634 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/vector-features.html

@@ -26,6 +26,11 @@
             var style_blue = OpenLayers.Util.extend({}, layer_style);
             style_blue.strokeColor = "blue";
             style_blue.fillColor = "blue";
+            style_blue.graphicName = "star";
+            style_blue.pointRadius = 10;
+            style_blue.strokeWidth = 3;
+            style_blue.rotation = 45;
+            style_blue.strokeLinecap = "butt";
 
             /*
              * Green style