title: Using config/secrets.yml in Rails 4.0.2 version
body: <p>I was reading <a href="http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html">http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html</a>
  and saw there the trick with <code>config/secrets.yml</code></p>
  
  <p>I moved my secret_base_keys to that file, and removed <code>secret_token.rb</code> file.</p>
  
  <p>But server doesn't start.</p>
  
  <pre><code>DEPRECATION WARNING: You didn't set config.secret_key_base. Read the upgrade documentation to learn more about this new config option. (called from service at /home/bismailov/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/webrick/httpserver.rb:138)
  [2014-01-15 16:15:51] ERROR RuntimeError: You must set config.secret_key_base in your app's config.
  </code></pre>
  
  <p>I believe that is because I don't use Rails 4.1 yet.</p>
  
  <p>Is there any way to implement this new functionality (secrets.yml) in Rails version 4.0? Maybe some kind of gem...</p>
  
  <p>Thank you very much!</p>