Added notion of mapping factory, so one can implement a handler without having to implement new_mapping

Added filter context handler
Added WSF_STARTS_WITH_ROUTING_HANDLER and WSF_URI_ROUTING_HANDLER (in addition to the uri template version)

library/server/wsf/router/wsf_router_mapping_factory.e

@@ -0,0 +1,32 @@
+note
+	description: "[
+				Component that know how to create a router mapping from request and response.
+				Usually handler inherits from this classes, this way, it is easy to use WSF_ROUTER.handle_... (resource, handler, ..)
+			]"
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+deferred class
+	WSF_ROUTER_MAPPING_FACTORY
+
+feature {WSF_ROUTER} -- Mapping
+
+	new_mapping (a_uri: READABLE_STRING_8): WSF_ROUTER_MAPPING
+			-- New mapping object
+		deferred
+		ensure
+			Result_attached: Result /= Void
+		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