Update Services/Soundcloud.php

I ve add some fix in order to handle CURLOPT_HEADER correctly.
Perhaps it will be helpfull. 
In my case curl_getinfo was returning a bad header_size so i has a problem to get use the json correctly.

Perhaps there change may to be to apply on this part to

$this->_lastHttpResponseHeaders = $this->_parseHttpHeaders(
            substr($data, 0, $info['header_size'])
        );

and use CURL_NOBODY options instead