Adding a way to decode to a specified version.

This is largely needed as a way to get a versioned client without
requiring everyone to switch to versioned types at once.

pkg/runtime/unstructured.go

@@ -78,6 +78,10 @@ func (unstructuredJSONScheme) DecodeIntoWithSpecifiedVersionKind(data []byte, ob
 	return nil
 }
 
+func (unstructuredJSONScheme) DecodeToVersion(data []byte, version string) (Object, error) {
+	return nil, nil
+}
+
 func (unstructuredJSONScheme) DataVersionAndKind(data []byte) (version, kind string, err error) {
 	obj := TypeMeta{}
 	if err := json.Unmarshal(data, &obj); err != nil {