anchor.diff:                      "display_name": "Boring Looking Galaxies",
                       "metadata": {
                           "category": "things"
  -                    },
  -                    "retirement": {
  -                        "criteria": "classification_count"
                       },
                       "created_at": "2014-02-13T10:11:34Z",
                       "updated_at": "2014-02-13T10:11:34Z",
  
positive.code:                     "metadata": {
                          "category": "things"
                      },
                      "retirement": {
                          "criteria": "classification_count"
                      },
                      "created_at": "2014-02-13T10:11:34Z",
                      "updated_at": "2014-02-13T10:11:34Z",
                      "set_member_subject_cound": 100,
                      "links": {
                          "project": "1",
                          "workflow": "10"
  
negative.code: Collection which will import the collection's subjects into a new
  SubjectSet.
  
  + Request
  
      + Headers
  