title: format numbers before sort in DataTables API
body: <p>I have a column in DataTables which holds some amounts and they are formatted like 1,200.00 and I want to get the max amount on the column. In order to do that I use the below code which I got a problem with at the moment if I have 22.50, 250.00, and 1,200.00 in the column it suppose to give me 1,200.00 as the max amount but it will bring back 250.00 as the biggest.</p>
  <pre><code>var maxPrice = table
          .column(2)
          .data()
          .sort(function(a,b){
              return a - b 
          })
          .reverse()[0];
  </code></pre>