title: How do I implement print functionality using FullCalendar plugin?
body: <p>I am using the fullcalendar as a demo. how do I implement print functionality ?
  I found a file 'fullcalendar.print.css' in FullCalendar package, what's that use for? </p>
  
  <p>If a have a button "Print" ,what will I do when clicking the button?
  Any help will be thankful!</p>