Add cmb to user-new.php

Cmb was not showing up when creating a new user, but only when editing an existing one. This is no longer the case. Now when creating new users you have the chance to add all the info right on the new-user.php page.

Signed-off-by: Emanuele <feliziani.emanuele@gmail.com>
Merge pull request #645 from GioSensation/trunk

Add cmb to user-new.php. props @GioSensation