Don't allow 1.8 clients to join...

they crash when encountering 1.8 blocks/items/etc

Spigot-Server-Patches/0041-Implement-a-few-1.8-features.patch

@@ -1,4 +1,4 @@
-From 8f6c0f5ec64da2c1ac31fc0b2edfd0188185a06e Mon Sep 17 00:00:00 2001
+From ffe49c3d17d1d1fb36e483d72f25c20684bd25a9 Mon Sep 17 00:00:00 2001
 From: Zach Brown <Zbob750@live.com>
 Date: Sun, 7 Sep 2014 15:45:58 -0500
 Subject: [PATCH] Implement a few 1.8 features
@@ -397,6 +397,25 @@ index 381ae78..e72e4e1 100644
      }
  
      protected Item getLoot() {
+diff --git a/src/main/java/net/minecraft/server/HandshakeListener.java b/src/main/java/net/minecraft/server/HandshakeListener.java
+index e0a1708..49568ea 100644
+--- a/src/main/java/net/minecraft/server/HandshakeListener.java
++++ b/src/main/java/net/minecraft/server/HandshakeListener.java
+@@ -72,7 +72,13 @@ public class HandshakeListener implements PacketHandshakingInListener {
+             }
+             // CraftBukkit end
+ 
+-            if (packethandshakinginsetprotocol.d() > 5 && packethandshakinginsetprotocol.d() != 47) { // Spigot
++            // PaperSpigot start - DC non-1.8 clients
++            if (packethandshakinginsetprotocol.d() != 47) {
++                chatcomponenttext = new ChatComponentText( "You must join using a 1.8 client!" );
++                this.b.handle(new PacketLoginOutDisconnect(chatcomponenttext), new GenericFutureListener[0]);
++                this.b.close(chatcomponenttext);
++            } else if (packethandshakinginsetprotocol.d() > 5 && packethandshakinginsetprotocol.d() != 47) { // Spigot
++                // PaperSpigot end
+                 chatcomponenttext = new ChatComponentText( org.spigotmc.SpigotConfig.outdatedServerMessage ); // Spigot
+                 this.b.handle(new PacketLoginOutDisconnect(chatcomponenttext), new GenericFutureListener[0]);
+                 this.b.close(chatcomponenttext);
 diff --git a/src/main/java/net/minecraft/server/Item.java b/src/main/java/net/minecraft/server/Item.java
 index 4382f1a..7493e42 100644
 --- a/src/main/java/net/minecraft/server/Item.java