title: Error Installing react-rails with Rails 5 beta.3
body: <p>Running a newly installed Rails 5 beta 3 with Ruby 2.2.3. Added <a href="https://github.com/reactjs/react-rails" rel="nofollow">react-rails 1.6.0</a> in the gem file then bundle install.</p>
  
  <p>Installed then <code>rails s</code>. Then error:</p>
  
  <blockquote>
    <p>Users/sylar/.rvm/gems/ruby-2.2.3/bundler/gems/rails-442207387e62/railties/lib/rails/railtie/configuration.rb:95:in <code>method_missing': undefined method</code>assets' for # (NoMethodError)</p>
  </blockquote>
  
  <p>Is this a react-rails issue or rails 5 itself? Works ok in Rails 4.2.5.</p>