make Bullet URDF parser more similar to the ROS URDF parser. There is still a difference in ordering of links,

due to the use of different hash-map implementations, with a difference in iterator order
(btHashMap versus std::hashmap)

examples/Importers/ImportURDFDemo/BulletUrdfImporter.cpp

@@ -177,7 +177,7 @@ std::string BulletURDFImporter::getLinkName(int linkIndex) const
 	if (linkPtr)
 	{
 		UrdfLink* link = *linkPtr;
-		std::string n = link->m_name;
+		return link->m_name;
 	}
 	return "";
 }