title: SyntaxError on the welcome to rails screen using Pow
body: <p>I have just set up a new project which displays all the correct info in the about your applications environment window when on <a href="http://localhost:3000/" rel="nofollow noreferrer">http://localhost:3000/</a> but when I run it at <a href="http://egg.dev/" rel="nofollow noreferrer">http://egg.dev/</a> I get:</p>
  
  <pre><code>SyntaxError: /users/davidhall/work/egg/config/initializers/session_store.rb:3: syntax error, unexpected ':', expecting $end
  ...sion_store :cookie_store, key: '_egg_session'
                                ^
  </code></pre>
  
  <p>I'm sure I had this problem earlier, which was due to me using rails 3.1 with ruby 1.8.7, the problem resolved when I used ruby 1.9.2. Now I'm getting when using 1.9.2 too.</p>
  
  <p>Thanks for any help its much appreciated!</p>