Add shops support.

data/plugins/shops/shop_item.rb

@@ -0,0 +1,20 @@
+require 'java'
+
+java_import 'org.apollo.cache.def.ItemDefinition'
+
+java_import 'org.apollo.game.model.Item'
+
+# An Item in a Shop.
+class ShopItem
+  attr_reader :amount, :cost, :id, :name
+
+  # Creates the ShopItem.
+  def initialize(id, amount, cost = nil)
+    definition = ItemDefinition.lookup(id)
+    @id = id
+    @amount = amount
+    @cost = cost.nil? ? definition.value : cost
+    @name = definition.name
+  end
+
+end