small changes to factory and implemented rmi awareness with a simple register/deregister program

rmi_Awareness/call_me_back.java

@@ -0,0 +1,15 @@
+package rmi_Awareness;
+
+
+
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+
+/**
+ * Created by Giovanni on 01/12/2014.
+ */
+public interface call_me_back extends Remote{
+
+    void notify (String in) throws RemoteException;
+
+}