title: angular-ui/ui-calendar: Display event information with mouseover
body: <p><a href="http://angular-ui.github.io/ui-calendar/" rel="nofollow">On the demo</a>,  I saw that the event name was popped up when the day was hovered.
  I've been searching the documentation, but I don't see any description as to how to make it happen. </p>
  
  <p>I suppose the event name would be displayed with <code>mouseover</code> and changing something in <code>uiConfig</code>.</p>
  
  <p>Any advice will be appreciated!</p>