users cookbook: Allow user gid to be specified.
users cookbook: Allow user gid to be specified.

wegtam/users,justintime/users,gsaslis/users,jordant/users,akroston/cookbook,gleamicus/users,RobertNorthard/users,cookbooks/mc-users,FlorentFlament/users,pielu/users,nickcharlton/users,RobertNorthard/users,FlorentFlament/users,gsaslis/users,site5/cookbook-users,wegtam/users,pielu/users,ongmingyang/users,justintime/users,opscode-cookbooks/users,chef-cookbooks/users,nkadel-skyhook/nkadel-chef-users,cookbooks/hw-users,gleamicus/users,cookbooks/nd-chef-opscode-users,cookbooks/oc-users,ongmingyang/users,opscode-cookbooks/users,iennae/users,site5/cookbook-users,jordant/users,chef-cookbooks/users,iennae/users,nkadel-skyhook/nkadel-chef-users,nickcharlton/users,akroston/cookbook