1、增加cookiejar支持

2、增加Setting结构，便于统一设置请求参数
3、增加服务端测试php脚本

httplib/httplib_test.php

@@ -0,0 +1,26 @@
+<?php
+session_id() or session_start();
+if (!isset($_SESSION['first_time'])) {
+  $_SESSION['first_time'] = time();
+}
+$data = array();
+$HTTP = array();
+foreach ($_SERVER as $head => $value) {
+  if (strpos($head, "HTTP_") === 0) {
+    $HTTP[$head] = $value;
+  }
+}
+$data['HTTP'] = $HTTP;
+$data['GET'] = $_GET;
+$data['POST'] = $_POST;
+$data['REQUEST'] = $_REQUEST;
+$data['SESSION'] = $_SESSION;
+$data['COOKIE'] = $_COOKIE;
+$data['FILES'] = $_FILES;
+$data['SERVER'] = $_SERVER;
+$data['ENV'] = $_ENV;
+
+//echo json_encode($data);
+//echo "<pre>";
+print_r($data);
+//echo "</pre>";