Now the 'router' library is part of 'wsf'

Move hello_routed_world under tests/dev since it was not really an example, but more a dev workspace/test

library/server/wsf/doc/router.txt

@@ -0,0 +1,14 @@
+This library introduce the notion of router and handler in the folder "router"
+The Router manages the association between URI,URI template and Handler
+The Router is in charge to route/dispatch a request to one of the Handler according to the URI and how the Handler is mapped in the Router.
+
+Common usage
+
+router: REQUEST_ROUTER
+hello_handler: REQUEST_HANDLER
+
+create {REQUEST_URI_TEMPLATE_ROUTER} router.make
+create {REQUEST_AGENT_HANDLER} hello_handler.make (agent handle_hello)
+
+router.map ("/hello/{name}", hello_handler)
+router.map_agent ("/hello/{name}", agent handle_hello)