Add request method and path to the NotFound exception message. This i…

…s useful for exception reporting tools.

lib/sinatra/base.rb

@@ -1050,7 +1050,7 @@ def route_missing
       if @app
         forward
       else
-        raise NotFound
+        raise NotFound, "#{request.request_method} #{request.path_info}"
       end
     end