Use PHP with your Yeoman dev server, config to run on `/` directory instead of `app/` (legacy project). More info see: http://coderwall.com/p/bal2_a

0001-chore-yeoman-add-PHP-server-capabitilies.patch

From 24c4a289dff902de91ac22e0d7d9d6c50331a22d Mon Sep 17 00:00:00 2001
From: Edouard Lopez <dev+git@edouard-lopez.com>
Date: Sat, 31 Aug 2013 11:25:14 +0200
Subject: [PATCH] chore(yeoman): add PHP server capabitilies

Following: https://coderwall.com/p/bal2_a
---
 Gruntfile.js |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Gruntfile.js b/Gruntfile.js
index 11ddda8..effe0d8 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -12,6 +12,7 @@ var mountFolder = function (connect, dir) {
 // use this if you want to recursively match all subfolders:
 // 'test/spec/**/*.js'
 
+var gateway = require('gateway');
 module.exports = function (grunt) {
     // show elapsed time at the end
     require('time-grunt')(grunt);
@@ -66,6 +67,10 @@ module.exports = function (grunt) {
                     middleware: function (connect) {
                         return [
                             lrSnippet,
+                            gateway(__dirname + '/', {
+                                '.php': 'php-cgi'
+                            }),
+                            mountFolder(connect, __dirname),
                             mountFolder(connect, '.tmp'),
                             mountFolder(connect, yeomanConfig.app)
                         ];
-- 
1.7.10.4

This solved all my grunt problems, thanks!