Remote Artisan Call

Artisan is almost in place already.
And you can execute whatever you need by adding commands to the `post_deploy_commands` array. So you can add

```
'post_deploy_commands' => array(
'php artisan cache:clear',
'php artisan db:seed --env=production',
),
```

What kind of improvements could we do on this area?

Start by reviewing how the deployment process handles the post_deploy_commands array and how Laravel Artisan commands are currently invoked. Clarify which remote Artisan improvements are wanted and define acceptance criteria before choosing an implementation.

Written by the indexing model from the issue text.