Updated to Minecraft 1.1

By: Erik Broes <erikbroes@grum.nl>

paper-server/src/main/java/org/bukkit/craftbukkit/util/LongHashset.java

@@ -21,6 +21,10 @@ public class LongHashset extends LongHash {
         }
     }
 
+    public int size() {
+        return count;
+    }
+
     public void add(int msw, int lsw) {
         add(toLong(msw, lsw));
     }