Added missing "context" classes for uri and starts_with mapping+handler (and helper classes).

So that it is address more needs.
Factorized code between "context" and non context classes.

library/server/wsf/router/wsf_router_methods.e

@@ -120,8 +120,6 @@ feature -- Basic operations
 		do
 			create Result.make_from_iterable (Current)
 			Result.add_methods (a_other)
-		ensure
-
 		end
 
 feature -- Element change