title: d3 histogram already binned
body: <p>Truth is, while I'm trying to make a histogram, maybe d3's histogram isn't the proper function to use as I already have data binned.  That is, my dataset looks like this:</p>
  
  <pre><code>time-in-seconds : count
  </code></pre>
  
  <p>where each entry is an hour.</p>
  
  <p>i.e.</p>
  
  <pre><code>{ "1380736800" : 14,
    "1380740400" : 3,
    "1380744000" : 14,
     and so on
  }
  </code></pre>
  
  <p>in human readable format:</p>
  
  <pre><code>{ "Oct 2, 2013 11:00AM" : 14,
    "Oct 2, 2013 12:00PM" : 3,
    "Oct 2, 2013  1:00PM  : 14,
     and so on
  }
  </code></pre>
  
  <p>Is d3's histogram the right tool to use?  Specifically, d3.layout.histogram?</p>