patch to HTTP/Request.php for proper chunked content handling

HTTP/Request.php does not stitch together received pieces of chunked content properly. Instead of moving from chunk to chunk in the response body, it was taking repeated substrings from the beginning of the body. Attached is a patch that fixes this. It also removes the call to the pdd() debugging function, which someone brought up in a previous message. Because it uses substr() and strlen(), I'm not sure if this patch (or the original code in HTTP/Request.php) is binary-safe (i.e. if there are ASCII 0 characters in the response body.) Does anyone have any thoughts about that? Thanks, -dave