Refines footer white spaces in both mobile and desktop versions

Before:
![captura de tela 2014-10-18 as 01 18 01](https://cloud.githubusercontent.com/assets/566971/4688514/e5830ba4-567d-11e4-82a6-084c80234b1e.png)
![captura de tela 2014-10-18 as 01 18 14](https://cloud.githubusercontent.com/assets/566971/4688515/e858ab0e-567d-11e4-8c04-8dba52214df5.png)


After:
![captura de tela 2014-10-18 as 01 18 22](https://cloud.githubusercontent.com/assets/566971/4688516/ed3e4156-567d-11e4-85f0-c2434323216b.png)
![captura de tela 2014-10-18 as 01 18 31](https://cloud.githubusercontent.com/assets/566971/4688517/f2438652-567d-11e4-8289-eec85bac02d6.png)