title: Autopep8 not breaking long comment lines?
body: <p>I tried using autopep8 to format some python code, expecting that comment lines above 80 characters would be split up, among other things. I used this test file <code>test.py</code>, which only consists of comments:</p>
  
  <pre><code>#asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
  #asdf asdf asdf asdf
  #asdf asdf asdf asdf
  
  #asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
  #asdf asdf asdf asdf
  #asdf asdf asdf asdf
  #asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
  </code></pre>
  
  <p>I then ran <code>autopep8 test.py</code></p>
  
  <p>This gives the following output:</p>
  
  <pre><code># asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
  # asdf asdf asdf asdf
  # asdf asdf asdf asdf
  
  # asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
  # asdf asdf asdf asdf
  # asdf asdf asdf asdf
  # asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
  # asdf asdf asdf asdf asdf asdf asdf asdf asdf asdf
  </code></pre>
  
  <p>The last long line is split, but the first two aren't.  I think all the lines should be broken at 80 characters wide.  What am I doing wrong?</p>