Finish path identification - configurability & exception handling

src/Exceptions/RouteIsMissingTenantParameterException.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Stancl\Tenancy\Exceptions;
+
+use Exception;
+use Stancl\Tenancy\Resolvers\PathTenantResolver;
+
+class RouteIsMissingTenantParameterException extends Exception
+{
+    public function __construct()
+    {
+        $parameter = PathTenantResolver::$tenantParameterName;
+
+        parent::__construct("The route's first argument is not the tenant id (configured paramter name: $parameter).");
+    }
+}