anchor.diff:  
       [Subject Version Collection][]
   
  -## Subject Collection [/subjects{?page,per_page,sort,workflow_id,subject_set_id}]
  +## Subject Collection [/subjects{?page,page_size,sort,workflow_id,subject_set_id}]
   Represents a collection of subjects.
   
   All collections add a *meta* attribute hash containing paging information.
  
positive.code: ### List all User Groups [GET]
  + Parameters
    + page (optional, integer) ... index of the page to retrieve 1 by default
    + per_page (optional, integer) ... number of items per page 20 by default
    + sort (optional, string) ... field to sort by, id by default
    + user_id (optional, integer) ... filter list to groups a user is part of
    + include (optional, string) ... comma separated list of linked resources to include in the response
  
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
  