Add devise gem and panel/users controller

app/models/item.rb

@@ -47,7 +47,7 @@ class Item
   
   def setup_default_value
     if self.position.blank?
-      max_page = Page.find(:last, :order => 'position')
+      max_page = Page.last(:order => 'position')
       self.position = (max_page)? max_page.position.to_i + 1 : 1
     end
     

app/models/user.rb

@@ -0,0 +1,6 @@
+class User
+  include MongoMapper::Document
+ 
+  devise :authenticatable, :recoverable, :rememberable, :trackable
+  
+end