title: reverse dataframe's rows' order with pandas
body: <p>How can I reverse the order of the rows in my <strong>pandas.dataframe</strong>?</p>
  
  <p>I've looked everywhere and the only thing people are talking about is sorting the <strong>columns</strong>, reversing the order of the <strong>columns</strong>...</p>
  
  <p>What I want is simple :</p>
  
  <p>If my DataFrame looks like this:</p>
  
  <pre><code>   A      B     C
   ------------------
    LOVE    IS   ALL
    THAT   MAT   TERS
  </code></pre>
  
  <p>I want it to become this: </p>
  
  <pre><code>   A      B     C
   ------------------
    THAT   MAT   TERS
    LOVE    IS   ALL
  </code></pre>
  
  <p>I know I can iterate over my data in reverse order but that's not what I want.</p>