Added SCOOP support for WSF.

WSF_SERVICE is deeply changed, and addition of WSF_EXECUTION.
Todo: code cleaning, removing useless things.

examples/simple_file/service_file_execution.e

@@ -0,0 +1,26 @@
+note
+	description: "Summary description for {SERVICE_FILE_EXECUTION}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	SERVICE_FILE_EXECUTION
+
+inherit
+	WSF_EXECUTION
+
+create
+	make
+
+feature {NONE} -- Initialization
+
+	execute
+		local
+			f: WSF_FILE_RESPONSE
+		do
+			create f.make_html ("home.html")
+			response.send (f)
+		end
+
+end