title: jQuery always has one checkbox checked
body: <p>With the following HTML checkbox code</p>
  
  <pre><code>&lt;input type="checkbox" class="example" checked /&gt;2016
  &lt;input type="checkbox" class="example" /&gt;2015
  &lt;input type="checkbox" class="example" /&gt;2014
  &lt;input type="checkbox" class="example" /&gt;2013
  &lt;input type="checkbox" class="example" /&gt;2012
  &lt;input type="checkbox" class="example" /&gt;2011
  &lt;input type="checkbox" class="example" /&gt;2010
  </code></pre>
  
  <p>What changes do I need to make to the following jQuery  </p>
  
  <pre><code> $(function() { 
       $('input[type="checkbox"]').bind('click',function() {
          $('input[type="checkbox"]').not(this).prop("checked", false);
       });
  });
  </code></pre>
  
  <p>so that one of the checkboxes is checked at all times not allowing blank checkboxes?</p>