It seems that the comment bundle is not compatible with the 2.3.7 symfony version.
Can you help me?
config.yml:
"require": {
        "php": ">=5.3.3",
        "symfony/symfony": "2.3.*",
        "doctrine/orm": ">=2.2.3,<2.4-dev",
        "doctrine/doctrine-bundle": "1.2.*",
        "twig/extensions": "1.0.*",
        "symfony/assetic-bundle": "2.3.*",
        "symfony/swiftmailer-bundle": "2.3.*",
        "symfony/monolog-bundle": "2.3.*",
        "sensio/distribution-bundle": "2.3.*",
        "sensio/framework-extra-bundle": "2.3.*",
        "sensio/generator-bundle": "2.3.*",
        "incenteev/composer-parameter-handler": "~2.0",
        "symfony/framework-bundle": "2.3.*",
        "friendsofsymfony/user-bundle": "1.3.*@dev",
        "friendsofsymfony/rest-bundle": "0.12.0",
        "friendsofsymfony/rest": "0.8.0",
        "jms/serializer-bundle": "0.12.0",
        "knplabs/knp-menu-bundle": "v1.1.2",
        "knplabs/knp-menu": "v1.1.2",
        "liip/imagine-bundle": "v0.17.0",
        "imagine/imagine": "v0.5.0",          
        "rodchyn/cron-manager-bundle": "dev-master",
        "bcc/extra-tools-bundle": "v1.0",
        "symfony/intl": "2.3.*@dev",
        "friendsofsymfony/comment-bundle": "2.0.5"
    },
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web",
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": {
            "dev-master": "2.3-dev"
        }
    },
     "config": {
        "bin-dir": "bin"
    },
    "minimum-stability": "stable",
}
Here the error:
 - Installation request for symfony/framework-standard-edition 2.3.x-dev -> satisfiable by symfony/framework-standard-edition[2.3.x-dev].
    - Conclusion: remove symfony/symfony v2.3.7
    - Conclusion: don't install symfony/symfony v2.3.7
    - Conclusion: don't install symfony/symfony v2.3.6
    - Conclusion: don't install symfony/symfony v2.3.5
    - Conclusion: don't install symfony/symfony v2.3.4
    - Conclusion: don't install symfony/symfony v2.3.3
    - Installation request for friendsofsymfony/comment-bundle 2.0.5 -> satisfiable by friendsofsymfony/comment-bundle[v2.0.5].
    - Conclusion: don't install symfony/symfony v2.3.2
    - friendsofsymfony/comment-bundle v2.0.5 requires symfony/symfony >=2.1,<2.3-dev -> satisfiable by symfony/symfony[v2.1.0, v2.1.1, v2.1.10, v2.1.11, v2.1.12, v2.1.13, v2.1.2, v2.1.3, v2.1.4, v2.1.5, v2.1.6, v2.1.7, v2.1.8, v2.1.9, v2.2.0, v2.2.1, v2.2.10, v2.2.11, v2.2.2, v2.2.3, v2.2.4, v2.2.5, v2.2.6, v2.2.7, v2.2.8, v2.2.9].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.0].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.1].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.10].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.11].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.12].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.13].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.2].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.3].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.4].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.5].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.6].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.7].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.8].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.9].
    - Can only install one of: symfony/symfony[v2.3.0, v2.2.0].