Overflow bugfix

On fadeIn/fadeOut animation the container's overflow parameter changes to hidden. This may cause problems (as it caused in my site :))

If you want to try this bug out, use this parameters:
```javascript
$("#wrapper").easytabs({
        animate			: true,
        updateHash		: true,
        transitionIn	: 'fadeIn',
        transitionOut	: 'fadeOut',
        animationSpeed	: 500,
        tabActiveClass	: 'active'
    });
```
On this HTML:
```html
<div id ="wrapper" class ="wrapper">
    <ul id ="navigation-menu" class ="navigation-menu">
        <li><a class ="profile" href="#profile"><span>Profile</span></a></li>
        <li><a class ="documents" href="#documents"><span>Documents</span></a></li>
    </ul>
    <div id ="container">
        <div id ="profile">
            asdf
        </div>
        <div id ="documents">
            asdf
        </div>
    </div>
</div>
```