L&S Minions

Okay, big commit :-D

I may split both commits into two PR, if necessary. 

First commit fixes serveral bugs in pathfinder, adds some comments and tidies up things a bit (removed the example map generator). Also i included a MazeChunkGenerator.

The modification on Chunk.java seems to be a huge performance improve (I saw that in profiler). 

The second commit adds code to let minions move along paths. Some content (not properly working right now) is included too.