anchor.diff:  
       [Aggregation][]
   
  -## Aggregation [/aggregations{?workflow_id,subject_id,page,per_page,sort,include}]
  +## Aggregation Collection [/aggregations{?workflow_id,subject_id,page,per_page,sort,include}]
   A Collection of Aggregation resources.
   
   All collections add a meta attribute hash containing paging
  
positive.code: 
      [CollectionPreference][]
  
  ## Aggregation [/aggregation/{id}{?include}]
  An Aggregation resource captures the results of the aggregation engine for
  the set of classifications for a particular workflow and subject.
  
negative.code: 
  + Response 200
  
      [Aggregation][]
  
  ### Edit an Aggregation [PUT]
  Only a user with rights on the workflow's project may edit an Aggregation resource.
  