Merge pull request #66 from gecos-team/desktop_background

Recipe: Change desktop background to all users
Merge pull request #67 from gecos-team/desktop_background

Recipe: Change verification of main variable
Removed utf8 character
Merge pull request #68 from gecos-team/sssd

Removed utf8 character
removed sssd from default.rb
Control if get attributes default and workgroup its '' then resource does nothing
Added new recipe local to provisioning the client from GCA
Update sssd.rb missed end
Update default.rb added default sssd->enabled to false
Fix srting to string
Change obejct to object
Added dconf package to desktop_background