title: Could not find generator cucumber:feature
body: <p>When I try to run <code>rails generate cucumber:feature</code>, I get an error - <code>Could not find generator cucumber:feature.</code></p>
  
  <p>In my gemfile:</p>
  
  <pre><code>group :test do
    gem 'cucumber-rails'
  
    # database_cleaner is not required, but highly recommended
    gem 'database_cleaner'
  end
  </code></pre>