Enabled session in 404 responses

Fixes #634

tests/ErrorTest.php

@@ -0,0 +1,18 @@
+<?php namespace Tests;
+
+class ErrorTest extends TestCase
+{
+
+    public function test_404_page_does_not_show_login()
+    {
+        // Due to middleware being handled differently this will not fail
+        // if our custom, middleware-loaded handler fails but this is here
+        // as a reminder and as a general check in the event of other issues.
+        $editor = $this->getEditor();
+        $this->actingAs($editor);
+        $notFound = $this->get('/fgfdngldfnotfound');
+        $notFound->assertStatus(404);
+        $notFound->assertDontSeeText('Log in');
+        $notFound->assertSeeText($editor->getShortName(9));
+    }
+}