title: Rails 3 does not see my class in "lib" directory
body: <p>I've placed the file <code>rack_app.rb</code> with simple Rack application in the <code>lib</code> directory:</p>
  
  <pre><code>class RackApp
    def call env
      [200, {}, 'Hello']
    end
  end
  </code></pre>
  
  <p>Then I've added this route:</p>
  
  <pre><code>match 'rack' =&gt; RackApp
  </code></pre>
  
  <p>And when I try to launch the rails server I get the following error:</p>
  
  <p><code>config/routes.rb:65: uninitialized constant RackApp (NameError)</code></p>