let CountryCode extend Serializable

Change-Id: I26126c1bc1557dfa138c10275fd4af850632a6bd

java/com.sap.sse.common/src/com/sap/sse/common/CountryCode.java

@@ -1,6 +1,8 @@
 package com.sap.sse.common;
 
-public interface CountryCode {
+import java.io.Serializable;
+
+public interface CountryCode extends Serializable {
 
     String getTwoLetterISOCode();
 

java/com.sap.sse.common/src/com/sap/sse/common/impl/CountryCodeImpl.java

@@ -3,6 +3,8 @@ package com.sap.sse.common.impl;
 import com.sap.sse.common.CountryCode;
 
 public class CountryCodeImpl implements CountryCode {
+    private static final long serialVersionUID = 74265853281480956L;
+    
     private final String name;
     private final String threeLetterIOCCode;
     private final String twoLetterISOCode;