added setOption and removeOption method for HttpClient.
added setOption and removeOption method for HttpClient.

to use this method, you can add ssl support, upload/download progress
support, ipv6 support etc.

cleey/hprose-php,xielingwang/hprose-php,comdeng/hprose-php,cleey/hprose-php,hprose/hprose-php