favicon and start screen

- added a favicon
- Made a few changes to the start screen
![after](https://cloud.githubusercontent.com/assets/6496177/4611070/9a09bb66-52b6-11e4-9b20-e0bd5fdf0354.png)
![before](https://cloud.githubusercontent.com/assets/6496177/4611071/9a17e81c-52b6-11e4-9e24-a1c3e934b27b.png)