Symfony2.1の安定板に固定するComposerの設定

composer.json

{
    "name": "symfony/framework-standard-edition",
    "description": "The \"Symfony Standard Edition\" distribution",
    "autoload": {
        "psr-0": { "": "src/" }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/symfony": ">=2.1.0,<2.1.x-dev",
        "doctrine/orm": ">=2.3.0,<2.3.x-dev",
        "doctrine/doctrine-bundle": ">=1.0.0,<1.0.x-dev",
        "twig/extensions": "1.0.*",
        "symfony/assetic-bundle": ">=2.1.0,<2.1.x-dev",
        "symfony/swiftmailer-bundle": ">=2.1.0,<2.1.x-dev",
        "symfony/monolog-bundle": ">=2.1.0,<2.1.x-dev",
        "sensio/distribution-bundle": ">=2.1.0,<2.1.x-dev",
        "sensio/framework-extra-bundle": ">=2.1.0,<2.1.x-dev",
        "sensio/generator-bundle": ">=2.1.0,<2.1.x-dev",
        "jms/security-extra-bundle": ">=1.2.0,<1.2.x-dev",
        "jms/di-extra-bundle": ">=1.1.0,<1.1.x-dev"
    },
    "scripts": {
        "post-install-cmd": [
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
        ],
        "post-update-cmd": [
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
        ]
    },
    "minimum-stability": "dev",
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web"
    }
}