Demo 0.15

Added:

• Tutorial level
• Blacksmith in the village (can improve equipment for gold)
• New artifacts
• New melee weapons
• Restoration and improvement of destroyed huts, road building
• New specializations (can be purchased in rebuilt healer and shaman huts)
• Permanent base upgrades for the blacksmith and construction
• Achievements
• New markers on the map, option to hide markers

Fixed minor bugs