laravel/app/providers/ArtisanServiceProvider.php

<?php namespace Providers;

use InspireCommand;
use Illuminate\Support\ServiceProvider;

class ArtisanServiceProvider extends ServiceProvider {

	/**
	 * Register the service provider.
	 *
	 * @return void
	 */
	public function register()
	{
		$this->commands('InspireCommand');
	}

}