Added abstraction WSF_ROUTED, and WSF_FILTERED.

Added under library/server/obsolete/v0 the previous non concurrent friendly version of EWF/WSF, for backward compatiblity.
Removed WSF_CALLBACK_SERVICE and WSF_TO_WGI_SERVICE which are not need with new EWF.

library/server/obsolete/v0/ewsgi/specification/service/wgi_service.e

@@ -0,0 +1,39 @@
+note
+	description: "[
+				WGI_SERVICE
+			]"
+	specification: "EWSGI specification https://github.com/Eiffel-World/Eiffel-Web-Framework/wiki/EWSGI-specification"
+	legal: "See notice at end of class."
+	status: "See notice at end of class."
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	WGI_SERVICE
+
+feature {WGI_CONNECTOR} -- Execution
+
+	execute (req: WGI_REQUEST; res: WGI_RESPONSE)
+			-- Execute the request
+			-- See `req.input' for input stream
+    		--     `req.meta_variables' for the CGI meta variable
+			-- and `res' for output buffer
+		require
+			res_status_unset: not res.status_is_set
+		deferred
+		ensure
+			res_status_set: res.status_is_set
+		end
+
+note
+	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+	source: "[
+			Eiffel Software
+			5949 Hollister Ave., Goleta, CA 93117 USA
+			Telephone 805-685-1006, Fax 805-685-6869
+			Website http://www.eiffel.com
+			Customer support http://support.eiffel.com
+		]"
+
+end