Restructure PaperSpigot as a new set of modules

Allows us much greater control over the Spigot portion of the code
and makes us more "proper"
Credit to @Dmck2b for originally passing the idea along a while back

Bukkit-Patches/0015-Add-Getter-for-Entity-Invulnerability.patch

@@ -0,0 +1,34 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: md_5 <md_5@live.com.au>
+Date: Sat, 3 Aug 2013 19:49:36 +1000
+Subject: [PATCH] Add Getter for Entity Invulnerability
+
+
+diff --git a/src/main/java/org/bukkit/entity/Entity.java b/src/main/java/org/bukkit/entity/Entity.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/entity/Entity.java
++++ b/src/main/java/org/bukkit/entity/Entity.java
+@@ -0,0 +0,0 @@ public interface Entity extends Metadatable {
+      * @return The current vehicle.
+      */
+     public Entity getVehicle();
++
++    // Spigot Start
++    public class Spigot
++    {
++
++        /**
++         * Returns whether this entity is invulnerable.
++         *         
++        * @return True if the entity is invulnerable.
++         */
++        public boolean isInvulnerable()
++        {
++            throw new UnsupportedOperationException( "Not supported yet." );
++        }
++    }
++
++    Spigot spigot();
++    // Spigot End
+ }
+--