phabricator: fix fallout from nixpkgs update

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Phabricator: recognize more directories

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Rename Phabricator user, fix permissions for socket

Signed-off-by: Austin Seipp <aseipp@pobox.com>
nixpkgs: update

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Improve phab-admin tools

Signed-off-by: Austin Seipp <aseipp@pobox.com>