anchor.diff:  
   + Response 200 (application/json)
       + Attributes (Source)
  +
  +### View a source with statements [GET /sources/{id}{?include}]
  +
  ++ Parameters
  +    + id: 1 (required, string) - ID of the source; TODO shouldn't we use URIs?
  +    + include: statements (string, optional) - include statements from this URI
  +
  ++ Response 200 (application/json)
  +    + Attributes (Source)
  +        + included (array[Statement Object])
   
   ## Sources list [/sources]
   
  
positive.code: + type: source (string, fixed)
  + attributes
      + uri: http://www.agerpres.ro/politica/2016/07/10/dragnea-de-cand-e-gabriela-firea-primar-nu-s-a-taiat-niciun-pom-pe-kiseleff-21-41-07 (string)
  
negative.code: + Response 200 (application/json)
      + Attributes (Statement)
  
  ## Statements list [/statements]
  
  ### Statements in given source [GET]
  
  This endpoint will return all the statements that are associated with
  the specified `uri`. If no `uri` parameter is set all the statements 
  in the database will be returned.
  
  + Response 200 (application/json)
      + Attributes
  