Add class for Ray's check-box

Fix some typos
Change the default index for auth
Add some hard code in object_auth.rb to handle page_context
A user cannot select himself in authorisation

app/models/object_auth.rb

@@ -15,8 +15,12 @@ class ObjectAuth  < PrototypeAuth
   end
 
   def check_user_has_can_access_app
-    sub_managing_users = auth_obj.module_app.sub_managing_users rescue []
-    module_app =  auth_obj.module_app
+    if auth_obj.is_a?(PageContext)
+      module_app = ModuleApp.where(key: 'page_content').first
+    else
+      module_app = auth_obj.module_app
+    end
+    sub_managing_users = module_app.sub_managing_users rescue []
     self.auth_users.each do |auth_user|
       if !sub_managing_users.include? auth_user && !auth_user.admin?
          module_app.assign_sub_manager(auth_user,User.current)