oregon trail banner, the masterpiece is complete

possibly the greatest ascii art of all time...

```Shell
MSFLOGO="oregon_trail.txt" ./msfconsole
```
![screen shot 2014-11-11 at 3 37 39 pm](https://cloud.githubusercontent.com/assets/620129/5001153/ba64eae8-69b8-11e4-9d8f-86ebd774b028.png)