Fix user model with new authentication

app/decorators/models/refinery/user_decorator.rb

 require 'acts_as_indexed'
 
 begin
-  Refinery::User.class_eval do
+  Refinery::Authentication::Devise::User.class_eval do
     # Docs for acts_as_indexed http://github.com/dougal/acts_as_indexed
     acts_as_indexed :fields => [:username, :email]
   end
 rescue NameError
-end
+end
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