Cookies, File upload and request body parsing added

Added basic support for

• Cookies
• Request body parsing
• File uploads
• Bug fixes
• Change server url

Fixed: Request name is already in use

Fixed this issue:

PHP Fatal error: Cannot declare class mbarquin\reactSlim\Request because the name is already in use in /var/www/ab-react-slim/src/vendor/mbarquin/reactphp-slim/src/Http/Request.php on line 10.

I'm experimenting this issue on PHP 7.0.9-1+deb.sury.org~wily+1. I'm not sure, but I think I had developed this library with 7.1.X I'm committing a new release to fix it, I hope it doesn't crash other versions.

Error on composer autoload path fixed

v0.4.1

Changed sources path

First development release

Few things are working, only the readme example functions