Add factory to create event header instances.  Wire up license shit for pro and pass hostId for node identifier
jackson2 is part of core now drop comment
Merge branch 'master' into NX-193-event-header

Conflicts:
	plugins/internal/nexus-analytics-plugin/src/main/java/org/sonatype/nexus/analytics/internal/EventExporterImpl.java
avoid null message
use nexus:wonderland perm
Merge pull request #381 from sonatype/NX-193-event-header

REVIEW: Add factory to create event header instances.
release: 2.8.0-m1
update to next version: 2.8.0-SNAPSHOT
NPE guard
log errors as ERROR
Merge remote-tracking branch 'origin/master' into rapture