Laravel 5.6 updates

Travis config update

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

vendor/bin/var-dump-server

@@ -0,0 +1,10 @@
+#!/usr/bin/env sh
+
+dir=$(cd "${0%[/\\]*}" > /dev/null; cd "../symfony/var-dumper/Resources/bin" && pwd)
+
+if [ -d /proc/cygdrive ] && [[ $(which php) == $(readlink -n /proc/cygdrive)/* ]]; then
+   # We are in Cgywin using Windows php, so the path must be translated
+   dir=$(cygpath -m "$dir");
+fi
+
+"${dir}/var-dump-server" "$@"

vendor/bin/var-dump-server.bat

@@ -0,0 +1,4 @@
+@ECHO OFF
+setlocal DISABLEDELAYEDEXPANSION
+SET BIN_TARGET=%~dp0/../symfony/var-dumper/Resources/bin/var-dump-server
+php "%BIN_TARGET%" %*