Pequenas mudancas

Pequenas mudanças de layout, além de adicionar tela de logout.
![captura de tela de 2014-07-23 00 01 45](https://cloud.githubusercontent.com/assets/3390275/3668454/0af6c290-121d-11e4-8539-e8c820966aec.png)
![captura de tela de 2014-07-23 00 09 20](https://cloud.githubusercontent.com/assets/3390275/3668455/0af749c2-121d-11e4-96b2-d0a61ab83bd1.png)
![captura de tela de 2014-07-23 00 21 21](https://cloud.githubusercontent.com/assets/3390275/3668456/0af883f0-121d-11e4-9498-17ce75761f98.png)
![captura de tela de 2014-07-23 00 53 01](https://cloud.githubusercontent.com/assets/3390275/3668457/0af9e2ea-121d-11e4-84ec-a5b7611b5b6f.png)