implemented HeartbeatClientHistoryInterface in HeartbeatMonitorWithHistory
updated
added "getEntries" to HeartbeatClientHistoryInterface and fixed error in HeartbeatClientHistoryAwareInterface
Adapted monitor of example with history
Scribbled HeartbeatClientHistoryEventInterface
Merge branch 'master' of https://github.com/stevleibelt/php_component_heartbeat

Conflicts:
	source/Net/Bazzline/Component/Heartbeat/HeartbeatClientHistoryInterface.php
	source/Net/Bazzline/Component/Heartbeat/RuntimeHeartbeatClientHistory.php