cleanups: go vet/golint (#331)

Go vet and golint the new code once again.

Drop Name from NameTemplate - it's cleaner: nametemplate.Template.

middleware/pkg/response/classify.go

@@ -68,6 +68,4 @@ func classify(t Type) Class {
 	default:
 		return Error
 	}
-	// never reached
-	return All
 }