Add EntityEquipment API. Adds BUKKIT-3103

Adds:
- Getting/Setting equipment
- getting/setting drop rates
- getting/setting ability to pick up items
-- As an added feature, players with this flag start off with a canceled PlayerPickupItemEvent

src/main/java/org/bukkit/craftbukkit/entity/CraftHumanEntity.java

@@ -28,6 +28,7 @@ import org.bukkit.craftbukkit.inventory.CraftInventoryPlayer;
 import org.bukkit.craftbukkit.inventory.CraftInventoryView;
 import org.bukkit.craftbukkit.inventory.CraftItemStack;
 import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.inventory.EntityEquipment;
 import org.bukkit.permissions.PermissibleBase;
 import org.bukkit.permissions.Permission;
 import org.bukkit.permissions.PermissionAttachment;
@@ -56,6 +57,10 @@ public class CraftHumanEntity extends CraftLivingEntity implements HumanEntity {
         return inventory;
     }
 
+    public EntityEquipment getEquipment() {
+        return inventory;
+    }
+
     public Inventory getEnderChest() {
         return enderChest;
     }