Added getContents() to IInventory and implemented it.

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

src/main/java/net/minecraft/server/InventoryCraftResult.java

@@ -0,0 +1,54 @@
+package net.minecraft.server;
+
+
+public class InventoryCraftResult
+        implements IInventory {
+
+    private ItemStack a[];
+
+    // CraftBukkit
+    public ItemStack[] getContents() {
+        return a;
+    }
+
+    public InventoryCraftResult() {
+        a = new ItemStack[1];
+    }
+
+    public int a() {
+        return 1;
+    }
+
+    public ItemStack a(int i) {
+        return a[i];
+    }
+
+    public String b() {
+        return "Result";
+    }
+
+    public ItemStack a(int i, int j) {
+        if (a[i] != null) {
+            ItemStack itemstack = a[i];
+
+            a[i] = null;
+            return itemstack;
+        } else {
+            return null;
+        }
+    }
+
+    public void a(int i, ItemStack itemstack) {
+        a[i] = itemstack;
+    }
+
+    public int c() {
+        return 64;
+    }
+
+    public void d() {}
+
+    public boolean a_(EntityPlayer entityplayer) {
+        return true;
+    }
+}