Added a larger map

This map can be accessed by clicking on the normal minimap.
![image](https://cloud.githubusercontent.com/assets/844422/4022199/ea32df4c-2b1e-11e4-9b94-3cf480d43b28.png)
(Ignore the bad fonts - I haven't yet installed the right fonts on my computer)

Also, I made it so minimaps can be any size (instead of just 7x7) and that minimap icons now scale to their correct size.

I'm planning on adding things like tracking, as well as hidden/unexplored tiles for things like dungeons or unexplored planets.