Well, small patch to add a few new things and fix some old ones:

- Fixed the villagers getting stuck in corners (I hope, you guys let me know after playing)
- Added new rock tiles to classify them easily when seen: Iron, Coal and Stone.
- Added more trees.
- Improved the performance of the game a little bit.
- Corrected bugs involved in the creation of land. (same tiles on top of each other, that caused lag)
- Fixed disappearing worm farms.

Hope you guys enjoy.