Merge pull request #24 from lukecyca/patch-2

User account creation fails on Debian 7.1

roles/common/tasks/users.yml

 - name: Create main user account
-  user: name=${main_user_name} state=present shell=/usr/bin/zsh groups=${main_user_name},sudo,fuse
+  user: name=${main_user_name} state=present shell=/usr/bin/zsh groups=sudo,fuse