Exit with non-zero if command fails, useful in scripting and CI

laravel/cli/artisan.php

@@ -43,7 +43,8 @@ try
 }
 catch (\Exception $e)
 {
-	echo $e->getMessage();
+	echo $e->getMessage().PHP_EOL;
+	exit(1);
 }
 
-echo PHP_EOL;
+echo PHP_EOL;