Prepare codebase to adhere to Checkstyle rules

Issue gh-393

samples/custom-cookie/src/main/java/sample/Initializer.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;
 
 import org.springframework.session.web.context.AbstractHttpSessionApplicationInitializer;
@@ -25,4 +26,4 @@ public class Initializer
 		super(Config.class); // <2>
 	}
 }
-// end::class[]
+// end::class[]