Optimized and expanded industry classifications

We've added a new Organization attribute "diffbotClassification" that expands industry classification to three or more levels, e.g.

"diffbotClassification": [
  {
    "level": 3,
    "isPrimary": true,
    "name": "Display Technology Companies",
    "diffbotUri": "https://diffbot.com/entity/IC_qvY0Oloiyj"
  },
  {
    "level": 2,
    "isPrimary": true,
    "name": "Computer Hardware Companies",
    "diffbotUri": "https://diffbot.com/entity/IC_D6llNR8xOo"
  },
  {
    "level": 1,
    "isPrimary": true,
    "name": "Software Companies",
    "diffbotUri": "https://diffbot.com/entity/IC_H04NbzO6L8"
  },
  ...
]

For NAICS and SIC classifications, we nominate a "primary" classification tier in the array of matching classification codes/labels. Documentation of these fields can be found in the Ontology section of docs.diffbot.com.