Fixed SSL support on the httpd component, and also on the EiffelWeb standalone connector.

- the standalone connector support for SSL, is using certicate files for now (no in-memory support).
  - to enable ssl support, set ecf variable `httpd_ssl_enabled=true`.
  - added the `simple_ssl` example to demonstrate how to have standalone ssl server.
    (be careful when using EiffelNet SSL and the http_client library, disable the libcurl
      via ecf variable `libcurl_http_client_disabled=true` )

Added support for recv timeout to the EiffelWeb standalone connector.
  - made EiffelWeb compilable with 16.05 and upcoming 16.11.
    Done via ecfs condition on version to accept EiffelNet with recv_timeout (from 16.11), and without (until 16.05).
  - adding recv timeout prevents server to hang for ever if a client wait too long to send data.

Updated various comments.

examples/simple_ssl/application.e

@@ -0,0 +1,29 @@
+note
+	description : "simple application root class"
+	date        : "$Date$"
+	revision    : "$Revision$"
+
+class
+	APPLICATION
+
+inherit
+	WSF_DEFAULT_SERVICE [APPLICATION_EXECUTION]
+		redefine
+			initialize
+		end
+
+create
+	make_and_launch
+
+feature {NONE} -- Initialization
+
+	initialize
+			-- Initialize current service.
+		do
+				-- Specific to `standalone' connector (the EiffelWeb server).
+				-- See `{WSF_STANDALONE_SERVICE_LAUNCHER}.initialize'
+ 			set_service_option ("port", 9090)
+ 			import_service_options (create {WSF_SERVICE_LAUNCHER_OPTIONS_FROM_INI}.make_from_file ("simple.ini"))
+		end
+
+end