map statistics
Merge remote-tracking branch 'origin/3.0' into 3.0

Conflicts:
	hazelcast/src/main/java/com/hazelcast/map/LockOperation.java
	hazelcast/src/main/java/com/hazelcast/map/MapMigrationOperation.java
	hazelcast/src/main/java/com/hazelcast/map/MapService.java
	hazelcast/src/main/java/com/hazelcast/map/PartitionContainer.java
	hazelcast/src/main/java/com/hazelcast/map/RecordStore.java
	hazelcast/src/main/java/com/hazelcast/map/TryLockOperation.java
	hazelcast/src/main/java/com/hazelcast/map/UnlockOperation.java
	hazelcast/src/main/java/com/hazelcast/map/proxy/MapProxySupport.java