Added event.preventDefault to lastclick and firstclick

Using event.preventDefault on the remaining clicks of the firstclick event and all lastclick events since there's no point in allowing default actions on them.

If I for example use the firstclick handler to to prevent multiple ajax requests I would have a event.preventDefault in it. But it would only be executed for the firstclick event, not the remaining click events. 

Of course it could be solved by using something like this.
```
$el.on("firstclick click", function (e) {
    e.preventDefault();
    if (e.type == "firstclick") {
        // Do stuff
    }
);
```

But that doesn't seem like the right way to do it.