NEW optional CORS
Update example
NEW `api_format` && `api_default_format` #5

    * `api_format` stick to one formatter;
    * `api_default_format` allow to choose default formatter;
Update POD
Update POD
Disable formatters #5

    * Routes: refactor `add` to support HASH params;
    * Endpoint: support for `api_format`;
Use `make_serializer_class`
NEW `enable => 'CORS'` paramter for enable Cross-origin resource sharing;
Brought into line with the latest changes;
NEW logger.t
Update README
Fix request `accept_format` #5
Fix logger
Enable CORS and stick to JSON formatter