Fix a ConcurrentModificationException

src/main/java/com/gmail/nossr50/party/runnables/PartyAutoKick.java

@@ -1,5 +1,7 @@
 package com.gmail.nossr50.party.runnables;
 
+import java.util.ArrayList;
+
 import org.bukkit.OfflinePlayer;
 
 import com.gmail.nossr50.config.Config;
@@ -16,8 +18,8 @@ public class PartyAutoKick implements Runnable {
         long currentTime = System.currentTimeMillis();
         long kickTime = 24L * 60L * 60L * 1000L * Config.getInstance().getAutoPartyKickTime();
 
-        for (Party party : PartyManager.getParties()) {
-            for (OfflinePlayer member : party.getMembers()) {
+        for (Party party : new ArrayList<Party>(PartyManager.getParties())) {
+            for (OfflinePlayer member : new ArrayList<OfflinePlayer>(party.getMembers())) {
                 if (currentTime - member.getLastPlayed() > kickTime) {
                     PartyManager.removeFromParty(member, party);
                 }