fix #7 getter for Manager(io)

src/main/java/com/github/nkzawa/socketio/client/Socket.java

@@ -72,7 +72,7 @@ public class Socket extends Emitter {
     private boolean disconnected = true;
     private int ids;
     private String nsp;
-    /*package*/ Manager io;
+    private Manager io;
     private Map<Integer, Ack> acks = new HashMap<Integer, Ack>();
     private Queue<On.Handle> subs;
     private final Queue<List<Object>> receiveBuffer = new LinkedList<List<Object>>();
@@ -407,6 +407,10 @@ public class Socket extends Emitter {
         return this.close();
     }
 
+    public Manager io() {
+        return io;
+    }
+
     private static Object[] toArray(JSONArray array) {
         int length = array.length();
         Object[] data = new Object[length];