title: How to disable future month and year in monthpicker
body: <p>I am using month picker, i want to restrict users from selecting future month and year. How can I achieve that ? 
  I tried using</p>
  
  <pre><code>$("#month").monthpicker({ dateFormat: 'M-yy',
              autoSize: true,
              changeYear: true,
              changeMonth: true,
              showButtonPanel: true,   
              maxDate: new Date().getMonth()
  
  });
  </code></pre>
  
  <p>but with this i could only restrict future year, i can still select future month. Any help will be appreciated.</p>