title: averaging every five minutes data as one datapoint in pandas dataframe
body: <p>I have a Dataframe in Pandas like this</p>
  
  <pre><code>1. 2013-10-09 09:00:05
  2. 2013-10-09 09:01:00
  3. 2013-10-09 09:02:00
  4.  ............
  5.   ............
  6.   ............
  7. 2013-10-10 09:15:05
  8. 2013-10-10 09:16:00 
  9. 2013-10-10 09:17:00
  </code></pre>
  
  <p>I would like reduce the size of the Dataframe by averaging every 5 mins data and forming 1 datapoint for it ..like this</p>
  
  <pre><code>1. 2013-10-09 09:05:00
  2. 2013-10-09 09:10:00
  3. 2013-10-09 09:15:00
  </code></pre>
  
  <p>Can someone help me with this ??</p>