Improve Top/Bottom Off screen nav effect and hide body scroll

Change list:
- Remove body scroll to prevent display a double scrollbar.
- Add From Top/Bottom off screen navs, Including a similar bouncing effect similar to this http://i.imgur.com/CJgMTNy.gif
- Some changes on effeckt/class names on Off screen navs
- Remove timer that produces repeat the last animation on the next animation.
- Separate Tabs Styles CSS from Effeckt.css
- Change the way of hide/show tabs on JS
- Now it's use `.data()` insted of `.attr()` on Positional Modal, when it uses `.data()` you avoid using the prefix `data-` just everything afterwards.
- Change Animation keyframes name to include the word `Bounce`
- Use modernize to check for touch device instead of `!!('ontouchstart' in window);`.
- Add `touchstart` event on every `click` event if it's a touch device.