Cleanup pass based on prior PRs (#21)

* Updates to stub generation

* More idiomatic fixes from PHP team

* Moved tests from src/tests -> tests, got rid of extension-only tests

* fixed up test paths, regenerated arginfo

tests/EventLoopGroupTest.php

@@ -0,0 +1,25 @@
+<?php
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+use AWS\CRT\IO\EventLoopGroup as EventLoopGroup;
+
+require_once('common.inc');
+
+final class EventLoopGroupTest extends CrtTestCase {
+
+    public function testLifetime() {
+        $elg = new EventLoopGroup();
+        $this->assertNotNull($elg, "Failed to create default EventLoopGroup");
+        $elg = null;
+    }
+
+    public function testConstructionWithOptions() {
+        $options = EventLoopGroup::defaults();
+        $options['num_threads'] = 1;
+        $elg = new EventLoopGroup($options);
+        $this->assertNotNull($elg, "Failed to create EventLoopGroup with 1 thread");
+        $elg = null;
+    }
+}