title: Counter most_common elements as a generator
body: <p>I'm using a <a href="http://docs.python.org/library/collections.html#collections.Counter" rel="nofollow">collections.Counter</a> object. I want to get the most common elements one by one but the <code>most_common</code> method gives me the whole list of elements.<br>
  Is there any way to get this list as a generator?  </p>