title: Determine the centroid of multiple points
body: <p>I'm writing a mapping application that I am writing in python and I need to get the lat/lon centroid of N points.
  Say I have two locations</p>
  
  <pre><code>a.lat = 101
  a.lon = 230
  
  b.lat = 146
  b.lon = 200
  </code></pre>
  
  <p>Getting the center of two points is fairly easy using a euclidean formula. I would like 
  to be able to do it for more then two points.</p>
  
  <p>Fundamentally I'm looking to do something like <a href="http://a.placebetween.us/" rel="noreferrer">http://a.placebetween.us/</a> where one can enter multiple addresses and find a the spot that is equidistant for everyone.</p>