[5.0] Config logging file name ['app.logfile']

Laravel 5.0
Is now possible to set a specific name for logging.

config/app.php
```php
return [
...
    'log' => 'daily',

    'logfile' => storage_path('logs/laravel-' . php_sapi_name(). '.log'),
...
]
```

The default log file name is "storage/logs/laravel.log"

This can solves the problem access to the logs for apache2handler and cli. As files are created daily with permissions 0644