ucloud/conf.php 为配置文件，按需填写：

-    $UCLOUD_PROXY_SUFFIX = '.cn-bj.ufileos.com';
-    $UCLOUD_PUBLIC_KEY = 'paste your public key here';
-    $UCLOUD_PRIVATE_KEY = 'paste your private key here';


Demo 目录中，包含各个接口的使用例子：
-    append.php
-    delete.php
-    get.php
-    multipart.php
-    mupload.php
-    put.php
-    uploadhit.php
