Add JSTL to JSP sample

spring-boot-samples/spring-boot-sample-web-jsp/src/main/java/org/springframework/boot/sample/jsp/WelcomeController.java

@@ -1,5 +1,8 @@
 package org.springframework.boot.sample.jsp;
 
+import java.util.Date;
+import java.util.Map;
+
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 
@@ -7,7 +10,8 @@ import org.springframework.web.bind.annotation.RequestMapping;
 public class WelcomeController {
 
 	@RequestMapping("/")
-	public String welcome() {
+	public String welcome(Map<String,Object> model) {
+		model.put("time", new Date());
 		return "welcome";
 	}