Mix-ins added for Jackson Serialization/deserialization

Fixes gh-434

samples/httpsession-redis-json/src/main/java/sample/web/LoginController.java

@@ -0,0 +1,16 @@
+package sample.web;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * @author jitendra on 3/3/16.
+ */
+@Controller
+public class LoginController {
+
+    @RequestMapping("/login")
+    public String login() {
+        return "login";
+    }
+}