Added set suffix support

src/net/milkbowl/vault/permission/Permission.java

@@ -444,4 +444,6 @@ public abstract class Permission {
     public String getPlayerSuffix(Player player) {
         return getPlayerSuffix(player.getWorld().getName(), player.getName());
     }
+    
+    abstract public void setPlayerSuffix(Player player, String suffix); 
 }

src/net/milkbowl/vault/permission/plugins/Permission_Permissions.java

@@ -352,4 +352,9 @@ public class Permission_Permissions extends Permission {
     public String getPlayerSuffix(String world, String playerName) {
         return this.permission.getHandler().getUserSuffix(world, playerName);
     }
+    
+    @Override
+    public void setPlayerSuffix(Player player, String suffix) {
+    	this.permission.getHandler().addUserInfo(player.getWorld().getName(), player.getName(), "suffix", suffix);
+    }
 }

src/net/milkbowl/vault/permission/plugins/Permission_PermissionsEx.java

@@ -389,4 +389,11 @@ public class Permission_PermissionsEx extends Permission {
             return null;
         }
     }
+    
+    @Override
+    public void setPlayerSuffix(Player player, String suffix) {
+    	PermissionUser user = PermissionsEx.getPermissionManager().getUser(player);
+    	if (user != null)
+    		user.setSuffix(suffix);
+    }
 }