Iterative in order over Counter object
<p>I have a Counter object that looks like this:</p>

<pre><code>counts = Counter({'foo': 10, 'baz': 5, 'biff': 3, 'bonk': 1})

for k, v in counts.items(): 
    print k, v

    bonk 1
    foo 10
    baz 5
    biff 3
</code></pre>

<p>What is the best way to iterative over the Counter object by descending frequency of the values? Speed is important. There is an OrderCounter class in the docs, but I was looking for something simpler.</p>
