title: datatables add class to filters
body: <p>I am currently seeking a method to add an additional custom class to the jQuery datatables filters (<strong>Records per page</strong> and <strong>Search</strong>)</p>
  
  <p>These items render as follow:</p>
  
  <pre><code>&lt;div id="DataTables_Table_0_length" class="dataTables_length"&gt;
      &lt;label&gt;
          &lt;select size="1" name="DataTables_Table_0_length" 
                  aria-controls="DataTables_Table_0"&gt;
              &lt;option value="10" selected="selected"&gt;10&lt;/option&gt;
              &lt;option value="25"&gt;25&lt;/option&gt;&lt;option value="50"&gt;50&lt;/option&gt;
              &lt;option value="100"&gt;100&lt;/option&gt;
          &lt;/select&gt;
          records per page
      &lt;/label&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>and </p>
  
  <pre><code>&lt;div class="dataTables_filter" id="DataTables_Table_0_filter"&gt;
      &lt;label&gt;
          Search: &lt;input type="text" aria-controls="DataTables_Table_0"&gt;
      &lt;/label&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Does anyone know how I can best add an additional class to each of them? Some advise would be as usual very much appreciated.</p>