Removed automatic showing of captions when switching slides

For a project at work we needed a version of the Cycle2 plugin that
doesn't automatically shows the caption when switching slides. A
small change to the core of the jQuery Cycle2 plugin was the easiest
route to take.

This can be accomplished by doing something like:

$('#cycle_slideshow').hover(
    function(){
        $('#cycle-overlay').show();
    },
    function(){
        $('#cycle-overlay').hide();
    }
);
Added code example to show caption on hover state