1.0.0: First version

* README.md text updated;
* Created a .gitignore;
* Renamed library name;
* Version changed from 1.1.0-alpha to 1.0.0;
* Removed ejetar/accept-header-interpreter, eject/laravel-formatter, illuminate/support and illuminate/http libraries;
* Added the symfony/serializer, symfony/yaml and laravel/framework libraries;
* Added 'prefer-stable' and 'extra' in composer.json;
* ExceptionHandler class created;
* Renamed namespace for ApiResponseFormatter;
* Renamed middleware;
* Middleware modified alias;
* Request class created;
* Created custom responses: CsvResponse, XmlResponse and YamlResponse;
* TestCase created (no implementation yet, only initial structure has been created)