Begin WebSocket support for Broadcast and Player control

modules/React/Cache/ArrayCache.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace React\Cache;
+
+use React\Promise;
+
+class ArrayCache implements CacheInterface
+{
+    private $data = array();
+
+    public function get($key)
+    {
+        if (!isset($this->data[$key])) {
+            return Promise\reject();
+        }
+
+        return Promise\resolve($this->data[$key]);
+    }
+
+    public function set($key, $value)
+    {
+        $this->data[$key] = $value;
+    }
+
+    public function remove($key)
+    {
+        unset($this->data[$key]);
+    }
+}