No longer need `fuse` group in Jessie.

roles/common/tasks/encfs.yml

 - name: Create encrypted directory
   file: state=directory path=/encrypted
 
-- name: Add mail user to fuse group
-  user: name=mail append=yes groups=fuse
-
-- name: Add main user to fuse group
-  user: name={{ main_user_name }} append=yes groups=fuse
-
 - name: Check if the /encrypted directory is empty
   shell: ls /encrypted/*
   ignore_errors: True