Added installation screen with progress bar. Can copy files to the target dir.


![image](https://f.cloud.github.com/assets/1102381/2430108/495a973e-acb8-11e3-95eb-fd4407523534.png)

![image](https://f.cloud.github.com/assets/1102381/2430109/60edd334-acb8-11e3-9d45-f51fbb45f7cb.png)



![image](https://f.cloud.github.com/assets/1102381/2430100/c5e54d86-acb7-11e3-8553-e1b4b056701c.png)

![image](https://f.cloud.github.com/assets/1102381/2430103/0f06b388-acb8-11e3-9c30-144c22adf594.png)