add MessageKey method to CommandIssuer and misc stuff

bungee/src/main/java/co/aikar/commands/BungeeCommandIssuer.java

@@ -43,6 +43,11 @@ public class BungeeCommandIssuer implements CommandIssuer{
         return (T) sender;
     }
 
+    @Override
+    public CommandManager getManager() {
+        return manager;
+    }
+
     @Override
     public boolean isPlayer() {
         return sender instanceof ProxiedPlayer;