Ui login

Implement basic function for the login page

![screenshot_2014-04-27-23-17-02](https://cloud.githubusercontent.com/assets/2566047/2813946/32735e14-ce9d-11e3-9816-9df83a546a56.png)
![screenshot_2014-04-27-23-16-57](https://cloud.githubusercontent.com/assets/2566047/2813948/32744afe-ce9d-11e3-8814-b080685c5744.png)
![screenshot_2014-04-27-23-16-01](https://cloud.githubusercontent.com/assets/2566047/2813947/3273eca8-ce9d-11e3-92a4-8c0afb299a93.png)