UPDATE 0.35 - Villagers stuck bug, and new graphical assets.

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.