Make checkbox tigger change event

[crazywako]

Add

    setChecked: function (checked) {
        this.$element.prop("checked", checked);
        this.trigger('change'); // This is now missing
        this.$element.prop("indeterminate", false);
        this.checkChecked();
    },

Add this.trigger('change'); so that we can listen for change event for example:

$('input').on('change',function(){
// TODO
});