Initialise TLS sockets directly if no socks5 proxy is configured

In cases where no proxy is configured, first establishing a TCP
connection and then upgrading the connection to TLS can cause errors
on some TLS servers.

This commit splits the logic in such a way that configurations without
proxies (presumably the majority!) will connect directly using
`ssl:connect`, whilst proxy connections will still establish a socket
first and then upgrade.

This fixes #160.

Add address family for inet:gethostbyname/2 call

fix to calling genserver.reply(:undefined, ....)

add erlang 19, 20 for test

The previously used inet:gethostbyname/1 would use IPv6 only if
inet_db:res_option(inet6) returned true, but the default resolver
setting for inet6 is false.

Added stream_full_chunks option

With this option, the process given by stream_to will get a message with chunk data each fully received chunk; stream_chunk_size is set to infinity for this. This is useful for certain applications that stream live data with each unit being represented by a single chunk; one example is CouchDB's continuous changes feed.

sock options ignored on ssl

Conn_timeout = get_value(connect_timeout, Options, Timeout),
    case do_connect(Host_1, Port_1, Options, State_2, Conn_timeout) of

for packaging in hex

Fix ibrowse_http_client.erl

Fix misprint in #130

Digest could mean HTTP Digest Authentication which is completely
different from what we call Digest currently. Renaming this is
essential to implement the actual HTTP Digest Authentication