anchor.diff:  ### List all Aggregations [GET]
   + Parameters
     + page (optional, integer) ... the index of the page to retrieve default is 1
  -  + per_page (optional, integer) ... number of items to include on a page default is 20
  +  + page_size (optional, integer) ... number of items to include on a page default is 20
     + sort (optional, string) ... field to sort by
     + workflow_id (optional, integer) ... workflow to see aggregations for
     + subject_id (optional, integer) ... subject_id to see aggregations for
  
positive.code: 
  + Response 204
  
  ## Membership Collection [/memberships{?page,per_page,sort,user_id,user_group_id}]
  A collection of Membership resources.
  
  All collections add a meta attribute hash containing paging
  
negative.code: ### List all CollectionPreferences [GET]
  + Parameters
    + page (optional, integer) ... the index of the page to retrieve default is 1
    + page_size (optional, integer) ... number of items to include on a page default is 20
    + sort (optional, string) ... field to sort by
    + user_id (optional, integer) ... user_id to see preferences for
    + collection_id (optional, integer) ... collection_id to see preferences for
  