Description:
------------
I wasn't able to find any option in the documentation enabling me to use a proxy in the curl calls. Tests using the stream method (with stream_context_set_default to declare the proxy) failed as well. 


Test script:
---------------
        /*$default_opts = array(
            'http'=>array(
                'method'=>"GET",
                'header'=>"Accept-language: en\r\n" .
                "Cookie: foo=bar",
                'proxy'=>"http://192.168.0.30:3128"
            )
        );

        $default = stream_context_set_default($default_opts);*/

        $this->_oauth = new \OAuth($options['consumerKey'], $options['consumerSecret']);
$this->_oauth->getRequestToken($this->_options['requestTokenUrl'], $this->_options['callbackUrl']);