fix devise migrations issue

db/migrate/20110913200833_devise_create_users.rb

@@ -34,7 +34,7 @@ class DeviseCreateUsers < ActiveRecord::Migration
       # t.datetime :locked_at
 
       # Token authenticatable
-      t.string :authentication_token
+      # t.string :authentication_token
 
       ## Invitable
       # t.string :invitation_token
@@ -46,7 +46,7 @@ class DeviseCreateUsers < ActiveRecord::Migration
     add_index :users, :reset_password_token, :unique => true
     # add_index :users, :confirmation_token,   :unique => true
     # add_index :users, :unlock_token,         :unique => true
-    add_index :users, :authentication_token, :unique => true
+    # add_index :users, :authentication_token, :unique => true
   end
 
   def self.down