add option to disable checking for proxy response

spigot/src/main/java/us/ajg0702/queue/spigot/Commands.java

@@ -17,7 +17,7 @@ public class Commands implements CommandExecutor {
 
 	@Override
 	public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
-		if(!pl.hasProxy()) {
+		if(!pl.hasProxy() && pl.config.getBoolean("check-proxy-response")) {
 			sender.sendMessage(color("&cajQueue must also be installed on the proxy!&7 If it has been installed on the proxy, make sure it loaded correctly and try relogging."));
 			return true;
 		}

spigot/src/main/resources/spigot-config.yml

@@ -11,8 +11,12 @@ send-queue-commands-in-batches: false
 # If you disable this, ajQueue will not be able to tell if the server is whitelisted!
 take-over-motd-for-whitelist: true
 
+# Should we check if the proxy responds to plugin messages?
+# For some reason this seems to fail for some people,
+#  so disable this if ajqueue says its not installed on the proxy when it actually is
+check-proxy-response: true
 
 
 
 # Dont touch this
-config-version: 2
+config-version: 3