Merge: Fix `-e` and `-n` on nit

These options where broken, and nobody complained.
Now they works again.

Pull-Request: #1777
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>
Reviewed-by: Romain Chanoir <romain.chanoir@viacesi.fr>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>

diff --cc src/loader.nit
Simple merge