Polish Hazelcast

* This commit moves the hazelcast support into a parent package
so that it no longer impies a Spring Data dependency.
* Add guards on SessionEntryListener logger
* Remove getSessionMapName on HazelcastHttpSessionConfiguration
* Use setSessionMapName on HazelcastHttpSessionConfiguration
rather than field access
* Formatting polish
* Fix Javadoc

Issue gh-276

samples/hazelcast-spring/src/main/java/sample/Config.java

@@ -17,7 +17,7 @@ package sample;
 
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.session.data.hazelcast.config.annotation.web.http.EnableHazelcastHttpSession;
+import org.springframework.session.hazelcast.config.annotation.web.http.EnableHazelcastHttpSession;
 import org.springframework.util.SocketUtils;
 
 import com.hazelcast.config.NetworkConfig;