SellItems

Function:

 * boolean sellItems(item, count)

Parameters:

 * item - can be item id/name
 * count - must be a number. Count of items bot should sell.

Return value:

 * This function return an boolean indicating if items were succesfuly sold. Returns true if success, false if failure.

Description:

 * This is the main function avaiable to sell items in NPC trade window. It automatically finds the item on the list and sells given ammount of it to a NPC.