psx 是一个用来开发 PHP 动态网站的框架，完全采用面向对象的方法进行设置，psx 严格的将代码和设计分离开来，其模版引擎是基于 XML 和 XSLT 的。
Changes:
1. Updated atom and RSS item parsing.
2/ The HTTP socks handler has been fixed with proper handling of chunked transfer encoding.
3. An OpenID provider implementation has been added.
4. This release updates the HTTP request class and fixes the curl handler.
5. The "Expect: 100-Continue" header has been removed and ca-bundle.pem updated.
6. The NestedSet library has been removed and new unit tests added.
7. Several bugs have been fixed
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