Add accessibility features

[llinde]

Hi

Any chance you could add tabindex="0" and role="button" on the dates?

The calendar is pretty much useless for users who only use the keyboard to navigate webpages.

Note:
I did try using a modified version of this code from your Demonstrations page, but with no luck:

showDateFilter: function(time, date)
{
	return '<div style="padding:0 5px;">\
			<span style="font-weight:bold">'+date+'</span>\
			<div style="opacity:0.3;">$'+Math.round(Math.random()*999)+'</div>\
  		   </div>';
}

Kind regards
Lars Linde