shuffle button
organizer.initShuffleButton = function() {
$('#shuffleCards').click(function() {
// reset panning
$('#universe').css('top', 0).css('left', 0).css('bottom', 0).css('right', 0);
var maxWidth = Math.round($('#container').width()*0.3) ;
var maxHeight = Math.round($('#container').height()*0.3);