Update 0.8.0

This update includes (but is not limited to):


 * Official Release!
 * Mountain Biome
 * New Seasons
 * New Animals: Porcupine
 * New Plants: Stinging Nettle
 * New items: Rifle, Bullet, Bear Pelt, Bear Jacket, Damaged Bear Jacket, Letters, Storage Container With many more!
 * And bug fixes