support for cowboy 1.1.x stream without size and chunked response

[brigadier]

Requires Cowboy 1.1.x Examples:

Bridge:set_response_data({chunked,
                              fun(Fun) ->
                                    Fun("Hello "),
                                    Fun("World"),
                                    ok
                              end}).

Bridge:set_response_data({stream,
                              fun(Socket, Transport) ->
                                    Transport:send(Socket, "Hello "),
                                    Transport:send(Socket, "World"),
                                    ok
                              end}).

[choptastic]

Looks good! Thanks.