Fix event system (#382)

src/server/events/MapleEvents.java

@@ -25,8 +25,10 @@ package server.events;
 /**
  * @author kevintjuh93
  */
-public class MapleEvents {
+public abstract class MapleEvents {
     public MapleEvents() {
      
     }
+    
+    public abstract int getInfo();
 }

src/server/events/RescueGaga.java

@@ -42,6 +42,10 @@ public class RescueGaga extends MapleEvents {
         public void complete() {
             completed++;
         }
+        
+        public int getInfo() {
+            return getCompleted();
+        }
 
         public void giveSkill(MapleCharacter chr) {
             int skillid = 0;