Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/symfony/routing/Tests/Fixtures/AnnotationFixtures/AbstractClassController.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Routing\Tests\Fixtures\AnnotationFixtures;
+
+abstract class AbstractClassController
+{
+}