update to 2.2.0 version

add OnPipeMessageEvent.php
add ProcessManager.php
add WorkerCache component
fix route bug
correct Exception to ZMException

test/usage_test.php

@@ -0,0 +1,10 @@
+<?php
+
+use ZM\Exception\ZMException;
+use ZM\Store\LightCache;
+
+LightCache::getMemoryUsage();
+try {
+    LightCache::getExpire('1');
+} catch (ZMException $e) {
+}