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

Build under R18 #129

removes doubled repl prompt