replace denyjoinfrom permission with ajqueue.joinfrom and config option

src/main/java/us/ajg0702/queue/Manager.java

@@ -459,7 +459,7 @@ public class Manager {
 			return;
 		}
 		
-		if(p.hasPermission("ajqueue.denyjoinfrom."+p.getServer().getInfo().getName())) {
+		if(pl.config.getBoolean("joinfrom-server-permission") && !p.hasPermission("ajqueue.joinfrom."+p.getServer().getInfo().getName())) {
 			p.sendMessage(msgs.getBC("errors.deny-joining-from-server"));
 			return;
 		}

src/main/resources/config.yml

@@ -1,5 +1,5 @@
 # Dont touch this number please
-config-version: 13
+config-version: 14
 
 # The time the server will wait between sending people in the queue
 #  Default: 5
@@ -104,3 +104,9 @@ prevent-joining-paused: false
 # When a server goes back online, should we send all players in the queue instantly?
 # Default: false
 send-all-when-back-online: false
+
+# Require a permission for players to be able to join a queue from a server
+# If enabled, players will need the permission ajqueue.joinfrom.<server> to join queues.
+# Replace <server> with the name of the server
+#  Default: false
+joinfrom-server-permission: false