Joomla Composer

composer.json

{
	"require": {
		"joomla/platform": ">=13.2"
	},
	"minimum-stability": "dev",
	"require-dev": {
		"phpunit/phpunit": "3.7.*"
	},
	"config": {
		"bin-dir": "bin",
		"vendor-dir": "libraries",
	}
}

platform-composer.json

{
    "name": "joomla/platform",
    "description": "A web application platform.",
    "keywords": ["joomla", "platform", "framework"],
    "license": "GPL",
    "require": {
        "php": ">=5.3.1",
        "joomla/access": ">=1.0.0",
        "joomla/cache": ">=1.0.0",
        "joomla/client": ">=1.0.0",
        "joomla/database": ">=1.0.0",
        "joomla/environment": ">=1.0.0"
    },
    "autoload": {
        "psr-0": {
            "Joomla\\Platform": "src/"
        },
        "files": [
            "src/helpers.php"
        ]
    },
    "minimum-stability": "dev"
}