Add person-specific variations to artist JSON-LD markup: birthDate, deathDate, birthPlace, deathPlace, and the Person type.
Add releaseOf and gtin14 to release serialization.
Fix property name for work ISWC.
Fix type and location property name for labels in JSON-LD
Merge branch 'json-ld-20141205' into beta

* json-ld-20141205:
  Fix type and location property name for labels in JSON-LD
  Fix property name for work ISWC.
  Add releaseOf and gtin14 to release serialization.
  Add person-specific variations to artist JSON-LD markup: birthDate, deathDate, birthPlace, deathPlace, and the Person type.