title: Rails: don't generate helpers
body: <p>I know this is simple but I don't remember how to do this and wasn't able to find it on Google...</p>
  
  <p>I rarely need a controller-specific helper file, so I would prefer that when I generate a Controller the helper (and helper spec) not be generated along with it.</p>
  
  <p>I tried</p>
  
  <pre><code>#application.rb
  config.generators do |g|
    g.helpers false
  end
  </code></pre>
  
  <p>...but that didn't work. How do you change that?</p>