{
    "name": "twig/twig",
    "type": "library",
    "description": "Twig, the flexible, fast, and secure template language for PHP",
    "keywords": ["templating"],
    "homepage": "http://twig.sensiolabs.org",
    "version": "1.4.0",
    "license": "BSD",
    "authors": [
        {
            "name": "Fabien Potencier",
            "email": "fabien@symfony.com"
        },
        {
            "name": "Armin Ronacher",
            "email": "armin.ronacher@active-4.com"
        }
    ],
    "require": {
        "php": ">=5.2.4"
    }
}

{
    "name": "twig/twig",
    "type": "library",
    "description": "Twig, the flexible, fast, and secure template language for PHP",
    "keywords": ["templating"],
    "homepage": "http://twig.sensiolabs.org",
    "version": "1.4.0",
    "license": "BSD",
    "authors": [
        {
            "name": "Fabien Potencier",
            "email": "fabien@symfony.com"
        },
        {
            "name": "Armin Ronacher",
            "email": "armin.ronacher@active-4.com"
        }
    ],
    "require": {
        "php": ">=5.2.4"
    },
    "autoload": {
        "psr-0" : {
            "Twig_" : "lib/"
        }
    }
}

Add Autoloadig instructions for Composer
Add Autoloadig instructions for Composer

Add psr-0 autoload directive to composer.json for easier Autoloading
when using Composer as a package management tool
