Move php to php5 and add a php7 example that uses composer

php5/test/gilded_rose_test.php

@@ -0,0 +1,14 @@
+<?php
+
+require_once 'gilded_rose.php';
+
+class GildedRoseTest extends PHPUnit_Framework_TestCase {
+
+    function testFoo() {
+        $items = array(new Item("foo", 0, 0));
+        $gildedRose = new GildedRose($items);
+        $gildedRose->update_quality();
+        $this->assertEquals("fixme", $items[0]->name);
+    }
+
+}