Update to Spring IO version

- Update Spring Boot 1.2.3.RELEASE
- Update Spring Security 4.0.0.RELEASE
- Update Spring 4.1.6.RELEASE
- Update Groovy 2.3.8
- Update Jackson 2.4.5
- Update Jedis 2.5.2
- Update Spring Data Redis 1.4.2

Fixes gh-126

samples/websocket/src/main/java/sample/mvc/CsrfController.java

@@ -0,0 +1,14 @@
+package sample.mvc;
+
+import org.springframework.security.web.csrf.CsrfToken;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class CsrfController {
+
+	@RequestMapping("/csrf")
+	public CsrfToken csrf(CsrfToken token) {
+		return token;
+	}
+}