API refactor
Merge pull request #2 from attila-kiss-everit/master

API refactor
10.10 commit
Merge remote-tracking branch 'everit.org/master'

Conflicts:
	api/pom.xml
	api/src/main/java/org/everit/heartbeat/api/AbstractClusteringHeartbeatService.java
	api/src/main/java/org/everit/heartbeat/api/dto/Node.java
	jgroups/src/main/java/org/everit/heartbeat/jgroups/JGroupsHeartbeatServiceImpl.java
heartbeat message sender switched from Thread to Timer imp.
Javadocs added
NodeTest class added