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

spring-session/build.gradle

@@ -23,7 +23,7 @@ dependencies {
 	integrationTestCompile "redis.clients:jedis:2.4.1",
 			"org.apache.commons:commons-pool2:2.2",
 			"redis.embedded:embedded-redis:$embeddedRedisVersion"
-	testCompile 'junit:junit:4.11',
+	testCompile "junit:junit:$junitVersion",
 			'org.mockito:mockito-core:1.9.5',
 			"org.springframework:spring-test:$springVersion",
 			'org.easytesting:fest-assert:1.4',

spring-session/src/test/java/org/springframework/session/web/http/SessionRepositoryFilterTests.java

@@ -27,7 +27,6 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 import java.util.NoSuchElementException;