If not stated otherwise, the textures are licensed under the
CC Attribution 3.0 license (http://creativecommons.org/licenses/by/3.0/)

Author				  Work(s)
===============================================================================

Matthi				- ashes, granite, rock
MimmoO				- brick
Nachtfalter			- amethyst, earth, earth_root, earth_spongy, firestone, gold, ice, ore, rock_smooth, ruby, sand, snow1, tunnel
Newton				- coal, ice3, water
Redwolf Design GmbH	- snow, lava
Win					- everrock