Update to Spring Data Hopper

Fixes gh-470

spring-session-data-redis/build.gradle

@@ -6,9 +6,12 @@ apply plugin: 'spring-io'
 description = "Aggregator for Spring Session and Spring Data Redis"
 
 dependencies {
-	compile project(':spring-session'),
-			"org.springframework.data:spring-data-redis:$springDataRedisVersion",
-			"redis.clients:jedis:$jedisVersion",
+	compile project(':spring-session')
+	compile ("org.springframework.data:spring-data-redis:$springDataRedisVersion") {
+		exclude group: "org.slf4j", module: 'slf4j-api'
+		exclude group: "org.slf4j", module: 'jcl-over-slf4j'
+	}
+    compile "redis.clients:jedis:$jedisVersion",
 			"org.apache.commons:commons-pool2:$commonsPoolVersion"
 }
 
@@ -18,4 +21,4 @@ dependencyManagement {
 			mavenBom "io.spring.platform:platform-bom:${springIoVersion}"
 		}
 	}
-}
+}