anchor.diff:  
   + Response 200
   
  -    [Aggeregation][]
  +    [Aggregation][]
   
   ### Edit an Aggregation [PUT]
   Only a user with rights on the workflow's project may edit an Aggregation resource.
  
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 Collection][]
  
  ### Create a Aggregation [POST]
  Creating an Aggregation requires an aggregation hash with the _workflow_version_
  