Add an option to disallow jailing offline players.

This closes #163 and adds a new configuration option

src/main/java/com/graywolf336/jail/command/subcommands/JailCommand.java

@@ -99,6 +99,11 @@ public class JailCommand implements Command {
         
         String uuid = "";
         if(p == null) {
+            if (!jm.getPlugin().getConfig().getBoolean(Settings.ALLOWJAILINGOFFLINEPLAYERS.getPath())) {
+                sender.sendMessage(Lang.PLAYERHASNEVERPLAYEDBEFORE.get());
+                return true;
+            }
+
             //TODO: Make this whole jail command non-blocking
             OfflinePlayer of = jm.getPlugin().getServer().getOfflinePlayer(params.getPlayer());
             

src/main/java/com/graywolf336/jail/enums/Lang.java

@@ -101,6 +101,8 @@ public enum Lang {
     UNJAILED("jailing"),
     /** The message sent to the person who released a prisoner from jail. */
     UNJAILSUCCESS("jailing"),
+    /** The message sent when you jailing offline players is not allowed. */
+    UNALLOWEDTOJAILOFFLINE("jailing"),
     /** The message went when an offline player is unjailed. */
     WILLBEUNJAILED("jailing"),
     /** The message sent when trying to jail a player in an unloaded world. */

src/main/java/com/graywolf336/jail/enums/Settings.java

@@ -2,6 +2,7 @@ package com.graywolf336.jail.enums;
 
 public enum Settings {
     ALLOWJAILINGNEVERPLAYEDBEFOREPLAYERS("jailing.jail.allowJailingNeverPlayedBeforePlayers"),
+    ALLOWJAILINGOFFLINEPLAYERS("jailing.jail.allowJaillingOfflinePlayers"),
     AUTOMATICCELL("jailing.jail.automaticCell"),
     AUTOMATICMUTE("jailing.jail.automaticMute"),
     BROADCASTJAILING("jailing.jail.broadcastJailing"),