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/Slot.java

@@ -0,0 +1,51 @@
+package net.minecraft.server;
+
+
+public class Slot {
+
+    public final int a; // CraftBukkit: private -> public
+    public final IInventory b; // CraftBukkit: private -> public
+    public int c;
+    public int d;
+    public int e;
+    
+    public Slot(IInventory iinventory, int i, int j, int k) {
+        b = iinventory;
+        a = i;
+        d = j;
+        e = k;
+    }
+
+    public void b() {
+        d();
+    }
+
+    public boolean a(ItemStack itemstack) {
+        return true;
+    }
+
+    public ItemStack c() {
+        return b.a(a);
+    }
+
+    public void b(ItemStack itemstack) {
+        b.a(a, itemstack);
+        d();
+    }
+
+    public void d() {
+        b.d();
+    }
+
+    public int a() {
+        return b.c();
+    }
+
+    public ItemStack a(int i) {
+        return b.a(a, i);
+    }
+
+    public boolean a(IInventory iinventory, int i) {
+        return iinventory == b && i == a;
+    }
+}