Changes for sub_roles

Issues: update doesn't create new i18n_variables, role form has bugs

spec/models/role_spec.rb

@@ -5,6 +5,7 @@ describe Role do
     @role = Role.create(:key => 'teacher', 
                         :i18n_variable => {:key => 'teacher', :en => 'Teacher', :zh_tw => 'Teacher in Chinese', :document_class => 'Role'},
                         :sub_roles => [{:key => 'undergrad', 
+                                        :i18n_variable => {:key => 'yeah', :en => 'Yeah', :zh_tw => 'Yeah', :document_class => 'Role'},
                                         :attribute_fields => [{:key => 'department'}, 
                                                               {:key => 'room'}]}, 
                                        {:key => 'master', 
@@ -35,6 +36,9 @@ describe Role do
       it 'should have :disabled false' do
         @role.sub_roles[0].disabled.should be false
       end
+      it 'should have a i18n_variable' do
+        @role.sub_roles[0].i18n_variable.should be_an_instance_of I18nVariable
+      end
     end
     describe '#AttributeField' do
       it 'should have :built_in false' do