Add factory to create event header instances.  Wire up license shit for pro and pass hostId for node identifier
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.