Fixed GGI connector, not able to add measurements (value=0) for GGBN if family isn't found in GGBN repository.
Update GGI connector. Added the boolean counterpart of the measurement: http://eol.org/schema/terms/NumberOfSequencesInGenBank
which is: http://eol.org/schema/terms/SequenceInGenBank
Fix Plazi resources, make external links within text objects work.
DATA-1358 Paleobiology Database (PBDB) Data Services. Follow-up work, added source and measurementUnit for specific measurements.
DATA-1410 Bring IRMNG structured data into TraitBank. Follow-up work, changed status measurementType from ConservationStatus to http://eol.org/schema/terms/ExtinctionStatus.
DATA-1453 Tweak to IUCN data terms
Merge pull request #92 from eliagbayani/master

DATA-1358, 1410, 1453, Plazi, GGI core metrics.