Prepare codebase to adhere to Checkstyle rules

Issue gh-393

samples/boot/src/main/java/sample/config/HttpSessionConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2014-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package sample.config;
 
 import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
@@ -21,4 +22,4 @@ import org.springframework.session.data.redis.config.annotation.web.http.EnableR
 // tag::class[]
 @EnableRedisHttpSession // <1>
 public class HttpSessionConfig { }
-// end::class[]
+// end::class[]