added new socket manager, errorhandling and testing is not finished yet

libs/React/EventLoop/Factory.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace React\EventLoop;
+
+class Factory
+{
+    public static function create()
+    {
+        // @codeCoverageIgnoreStart
+        if (function_exists('event_base_new')) {
+            return new LibEventLoop();
+        } elseif (class_exists('libev\EventLoop', false)) {
+            return new LibEvLoop;
+        } elseif (class_exists('EventBase', false)) {
+            return new ExtEventLoop;
+        }
+
+        return new StreamSelectLoop();
+        // @codeCoverageIgnoreEnd
+    }
+}