Add gihub package to composer.json

composer.json

"repositories": [
        {
            "type": "package",
            "package": {
                "version": "master",
                "name": "turbod/bootstrap",
                "source": {
                    "url": "https://github.com/turbod/bootstrap.git",
                    "type": "git",
                    "reference": "master"
                },
                "dist": {
                    "url": "https://github.com/turbod/bootstrap/zipball/master",
                    "type": "zip"
                }
            }
        }
    ],