Replaced Skeleton Charm icon

Replacing the current icon for the Skeleton Charm since it was just created in a hurry ( = Fire Skull sprite) to create an annual Halloween quest ASAP. Actually I was asked to create this icon in October 2013 but people forgot.
@wushin Don't understand. I deleted the one ")" in "(CC BY-SA 3.0))" that was too much. Is that a problem?