This is my fault, I'm still a bit new to composer and haven't figured everything out quite yet. I have forked `AustP/Stylus.php` and added file to string compilation, so I needed to depend on my fork. Packagist also sais that `Do not submit forks of existing packages.` so I didn't want to submit it there.

I think that the correct thing to do is add something like this: (taken from: https://getcomposer.org/doc/05-repositories.md#vcs)
```json
{
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/igorw/monolog"
        }
    ],
    "require": {
        "monolog/monolog": "dev-bugfix"
    }
}
```

@stof Any thoughts/recommendation?