Add repo fuel-nestedset as submodule to fuel/packages/nestedset
Update submodules
Update models to use fully-classified namespaces
Add fist version of Gasauth with Acl
Update submodule hubspace/fuel-nestedset
Add next version of gasauth with support for \Gasauth::has_access
Update submodule reference on 'nestedset'
Add lang files for buttons and global
Add first version of module users

* Supports
  * Login
  * Logout
  * Reset password
  * Registration
  * Account confirmation
Rename theme 'bootstrap' view 'topbar' to 'default'