TABDEV-1875: Add parentActor
TABDEV-1533: Add the JiveExternalURLEntity type.
Merge branch 'TABDEV-1875' into develop

* TABDEV-1875:
  TABDEV-1875: Add parentActor
Merge branch 'TABDEV-1533' into develop

* TABDEV-1533:
  TABDEV-1533: Add the JiveExternalURLEntity type.
TABDEV-1533: Move JiveExternalURLEntity.h to public headers.