title: I want mount Resque on a subpath in your existing Rails 4
body: <p>rails3  resque(1-x-stable) I do like this at my routes.rb :</p>
  
  <p>require 'resque/server'
  mount Resque::Server.new, :at => "/resque"</p>
  
  <p>but now I use rails 4 resque(2.0.0.pre.1),  it has same problems like this:</p>
  
  <p>uninitialized constant Resque::Server (NameError)</p>
  
  <p>What can I do ?</p>