- CURLOPT_COOKIELIST needs curl 7.15

- CURLOPT_COOKIELIST needs curl 7.15
- fixed  typo in phpstr.h
- reimplemented encoding api
- removed http_gzencode()/http_gzdecode(); zlib *can* do that
- http_deflate() accepts various flags now, pass
  HTTP_DEFLATE_TYPE_GZIP for gzip encoding;
  HTTP_DEFLATE_TYPE_ZLIB (default) for HTTP deflate (AKA zlib) encoding
  HTTP_DEFLATE_TYPE_RAW for raw deflate encoding (same as PHPs gzdeflate);
- http_inflate() can decode all 3 formats