fix a few java warnings

src/forge/CardFactory.java

@@ -8,7 +8,6 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
 
 import javax.swing.JOptionPane;
 
@@ -4222,6 +4221,7 @@ public class CardFactory implements NewConstants {
         	final int count = Integer.parseInt(card.getKeyword().get(bloodthirst).split(" ")[1]);
         	
         	card.addComesIntoPlayCommand(new Command() {
+				private static final long serialVersionUID = -1849308549161972508L;
 
 				public void execute() {
 					if(card.getController().getOpponent().getAssignedDamage() > 0)

src/forge/ComputerUtil_Attack2.java

@@ -1,8 +1,6 @@
 package forge;
 
-import java.security.PublicKey;
 import java.util.ArrayList;
-import java.util.Hashtable;
 import java.util.Random;
 
 //doesHumanAttackAndWin() uses the global variable AllZone.ComputerPlayer

src/forge/Cost_Payment.java

@@ -1,7 +1,5 @@
 package forge;
 
-import java.util.ArrayList;
-
 import javax.swing.JOptionPane;
 
 import forge.gui.GuiUtils;

src/forge/EndOfTurn.java

@@ -1,9 +1,5 @@
 package forge;
 
-import java.util.HashMap;
-
-//import java.util.*;
-
 //handles "until end of turn" and "at end of turn" commands from cards
 public class EndOfTurn implements java.io.Serializable
 {

src/forge/PhaseUtil.java

@@ -1,7 +1,6 @@
 package forge;
 
 import java.util.ArrayList;
-import java.util.HashMap;
 
 public class PhaseUtil {
 	// ******* UNTAP PHASE *****