title: NoMethodError: undefined method `last_comment' after upgrading to rake 11
body: <p>When running any <code>rake</code> task I get:</p>
  
  <blockquote>
    <p>NoMethodError: undefined method `last_comment' for</p>
    
    <h1></h1>
  </blockquote>
  
  <p>This was after <code>bundle update</code> which pulled in the new version of rake, version <code>11.0.1</code>.</p>
  
  <pre><code>$ grep rake Gemfile.lock
         rake
         rake (&gt;= 0.8.7)
       rake (11.0.1)
         rake
  $ bundle update
  $ bundle exec rake db:drop # any rake task
  </code></pre>
  
  <blockquote>
    <p>NoMethodError: undefined method `last_comment' for #&lt; Rake::Application:0x007ff0cf37be38></p>
  </blockquote>
  
  <p><strong>Versions</strong></p>
  
  <ul>
  <li>Rails 3.2.11</li>
  <li>Rake 11.0.1</li>
  </ul>