composer.json

{
    "name": "duodraco/interconphp-todo",
    "description": "Repository for InterconPHP Challenge",
    "minimum-stability": "stable",
    "license": "MIT",
    "authors": [
        {
            "name": "Anderson Casimiro",
            "email": "o@duodra.co"
        }
    ],
    "require-dev":{
        "behat/behat":"2.5@stable",
        "behat/mink-extension":"*",
        "behat/mink-selenium2-driver":"*"
    },
    "config": {
        "bin-dir": "bin/"
    },
    "scripts":{
        "post-install-cmd":[
            "wget --progress=bar:force 'http://chromedriver.storage.googleapis.com/'`curl http://chromedriver.storage.googleapis.com/LATEST_RELEASE`'/chromedriver_linux64.zip'",
            "unzip -d bin/ chromedriver_linux64.zip",
            "rm chromedriver_linux64.zip",
            "wget --progress=bar:force -O bin/selenium.jar http://selenium-release.storage.googleapis.com/2.42/selenium-server-standalone-2.42.2.jar"
        ]
    }
}

Pena não ter rolado - selenium ainda não suporta.