x-salada animated

x-salada is awesome, why not animated?

This PR adds a simple animation for x-salada components. it's possible see the animation [here](http://www.raphaelfabeni.com.br/x-salada/) or below:

![x-salada](https://cloud.githubusercontent.com/assets/1345662/5562707/c86f7244-8e1a-11e4-8868-7a7dcdc2b831.gif)