Add locale negotiator and support for YAML
- refactor: split file path using unix and windows delimeter both 9957580
- feat: add negotiator to I18nManager class bf58214
- refactor: make data param optional when formatting message bd6d362
- feat: add support for yaml files 507001e
- improvement: update instructions to create resources/lang directory 4e8f37d
- fix: config stub to use correct property names and reference URL f2a6c48