js extension

gistfile1.txt

```js
extension(account_create_operation_ext = new Serializer( 
    "extension account_create_operation_ext",
    {value: account_create_operation_ext}
));

var account_create = new Serializer( 
    "account_create",
    {fee: asset,
    registrar: protocol_id_type("account"),
    referrer: protocol_id_type("account"),
    referrer_percent: uint16,
    name: string,
    owner: authority,
    active: authority,
    options: account_options,
    extensions: extension(account_create_operation_ext)}
);

var account_update_operation_ext = new Serializer( 
    "account_update_operation_ext",
    {null_ext: optional(void_result),
    owner_special_authority: optional(special_authority),
    active_special_authority: optional(special_authority)}
);

extension(account_update_operation_ext = new Serializer( 
    "extension account_update_operation_ext",
    {value: account_update_operation_ext}
));

var account_update = new Serializer( 
    "account_update",
    {fee: asset,
    account: protocol_id_type("account"),
    owner: optional(authority),
    active: optional(authority),
    new_options: optional(account_options),
    extensions: extension(account_update_operation_ext)}
);
```