Revert "[padrino-core] to_s route paths before joining"

This reverts commit aaad729.

padrino-core/lib/padrino-core/mounter.rb

@@ -106,7 +106,7 @@ def named_routes
       app_obj.routes.map { |route|
         name_array     = "(#{route.named.to_s.split("_").map { |piece| %Q[:#{piece}] }.join(", ")})"
         request_method = route.conditions[:request_method][0]
-        full_path = File.join(uri_root, route.original_path.to_s)
+        full_path = File.join(uri_root, route.original_path)
         next if route.named.blank? || request_method == 'HEAD'
         OpenStruct.new(:verb => request_method, :identifier => route.named, :name => name_array, :path => full_path)
       }.compact