Added Umbral Creation to the game.

Some changes to achievements_lib.lua

New file: data/npc/scripts/Eruaran.lua

Added Umbral Creation almost 100% like Tibia RL. (The chances for creating/improvement/transforming are not the same. Should be updated)
Umbral Creation was created following the info found at http://tibia.wikia.com/wiki/Umbral_Creation
The weapons and items required are the same as Tibia RL.
NPC Transcripts are not 100% like Tibia RL. Also there are some keywords that doesn't have response. I didn't added them because i couldn't find the real transcripts.

To be added: Umbral-Achievements