Clone router prior to dispatching Laravel request.

This is a short-term fix and needs a little more investigation into possible
performance issues with cloning the router before every dispatch.

This is probably something that could be done primarily for the dispatcher
or even re-work the internal dispatcher so that it doesn't even utilzie
the actual Laravel router but instead uses its own.

Reference issue dingo#964 and dingo#966.

Author: jasonlewis

src/Routing/Adapter/Laravel.php

@@ -77,7 +77,13 @@ public function dispatch(Request $request, $version)
 
         $this->router->setRoutes($routes);
 
-        return $this->router->dispatch($request);
+        $router = clone $this->router;
+
+        $response = $router->dispatch($request);
+
+        unset($router);
+
+        return $response;
     }
 
     /**