Windows time_t is not a long, but long-long, then stick with int64_t
so it works everywhere (converts to time_t internally).
And there is no gmtime_r(), then use the gmtime() if not detected.
CURL needs some special curl_easy_setopt() calls to enable automatic
gzip deflate (CURLOPT_ENCODING) and
If-Modified-Since/If-Unmodified-Since logic.
As If-Modified-Since/If-Unmodified-Since requires a timestamp string,
let's expose class methods to handle those.
Document some proxy behavior like done by CURL, so we'll follow that
standard, with $http_proxy, $socks_proxy, $all_proxy and $no_proxy.
also add some missing @since.
This class implements the Efl.Net.Dialer interface using libcurl to
perform HTTP requests. That means it's an Efl.Net.Dialer,
Efl.Net.Socket, Efl.Io.Reader, Efl.Io.Writer and Efl.Io.Closer, thus
being usable with Efl.Io.Copier as demonstrated in the
efl_io_copier_example.c
Daniel Kolesa
Gustavo Sverzut Barbieri
Stefan Schmidt