Added getContents() to IInventory and implemented it.

Implemented Inventory and PlayerInventory and updated StorageMinecart and Slot.
Added getMaxStackSize to CraftItemStack.

src/main/java/org/bukkit/craftbukkit/CraftInventoryPlayer.java

@@ -0,0 +1,67 @@
+package org.bukkit.craftbukkit;
+
+import java.util.ArrayList;
+
+import net.minecraft.server.InventoryPlayer;
+
+import org.bukkit.ItemStack;
+import org.bukkit.PlayerInventory;
+
+public class CraftInventoryPlayer extends CraftInventory implements PlayerInventory {
+    public CraftInventoryPlayer(net.minecraft.server.InventoryPlayer inventory) {
+        super(inventory);
+    }
+    
+    public InventoryPlayer getInventory() {
+        return (InventoryPlayer) inventory;
+    }
+
+    public ArrayList<ItemStack> getArmorContents() {
+        ArrayList<ItemStack> items = new ArrayList<ItemStack>();
+        for (net.minecraft.server.ItemStack item : getInventory().getArmorContents()) {
+            ItemStack i = null;
+            if (item != null) {
+                i = new CraftItemStack(item);
+            }
+            items.add(i);
+        }
+
+        return items;
+    }
+
+    public ItemStack getItemInHand() {
+        return new CraftItemStack( getInventory().e() );
+    }
+
+    public ItemStack getHelmet() {
+        return getItem( getSize() - 4 );
+    }
+
+    public ItemStack getChestplate() {
+        return getItem( getSize() - 3 );
+    }
+
+    public ItemStack getLeggings() {
+        return getItem( getSize() - 2 );
+    }
+
+    public ItemStack getBoots() {
+        return getItem( getSize() - 1 );
+    }
+
+    public void setHelmet(ItemStack helmet) {
+        setItem( getSize() - 4, helmet );
+    }
+
+    public void setChestplate(ItemStack chestplate) {
+        setItem( getSize() - 3, chestplate );
+    }
+
+    public void setLeggings(ItemStack leggings) {
+        setItem( getSize() - 2, leggings );
+    }
+
+    public void setBoots(ItemStack boots) {
+        setItem( getSize() - 1, boots );
+    }
+}