Specify a git commit as composer dependency

"require": [
        "laravelbook/ardent": "dev-master"
],
"repositories": [
        {
                "type": "package",
                "package": {
                        "name": "laravelbook/ardent",
                        "version": "dev-master",
                        "source": {
                                "type": "git",
                                "url": "https://github.com/bexarcreativeinc/ardent.git",
                                "reference": "master"
                        },
                        "autoload": {
                                "psr-0": {
                                        "LaravelBook\\Ardent": "src/"
                                }
                        }
                }
        }
]