Melhorias de UX

* Ajustes visuais
* Melhorias de usabilidade nos campos de textos
* Extrato separado por meses

![ios simulator screen shot oct 4 2014 3 07 15 am](https://cloud.githubusercontent.com/assets/380338/4514783/2e411c2e-4b8d-11e4-98ef-f3aaa160dd88.png)

![ios simulator screen shot oct 4 2014 3 10 38 am](https://cloud.githubusercontent.com/assets/380338/4514784/39bfa0d4-4b8d-11e4-9f08-9b8f8fd28819.png)

![ios simulator screen shot oct 4 2014 2 59 11 am](https://cloud.githubusercontent.com/assets/380338/4514785/427b9a84-4b8d-11e4-8223-f6cf9a3529ad.png)