Merge pull request #10918 from samdjstevens/5.1

[5.1] Fix issue where "/" route cannot be excluded from default CSRF token verification

Author: taylorotwell

src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php

@@ -62,7 +62,11 @@ public function handle($request, Closure $next)
     protected function shouldPassThrough($request)
     {
         foreach ($this->except as $except) {
-            if ($request->is(trim($except, '/'))) {
+            if ($except !== '/') {
+                $except = trim($except, '/');
+            }
+
+            if ($request->is($except)) {
                 return true;
             }
         }