Added a nicer toString() to DirectionalLight.

jme3-core/src/main/java/com/jme3/light/DirectionalLight.java

@@ -132,6 +132,11 @@ public class DirectionalLight extends Light {
         return Type.Directional;
     }
 
+    @Override
+    public String toString() {
+        return getClass().getSimpleName() + "[name=" + name + ", direction=" + direction + ", color=" + color + ", enabled=" + enabled + "]";
+    }
+
     @Override
     public void write(JmeExporter ex) throws IOException {
         super.write(ex);