Refactor GET /pins response

[Tmw]

This is a proposal for the GET /pins response route. All excess fields have been stripped so all is left is what the front-end actually needs.

{  
   "pins":[  
      {  
         "id":"P1CDIAM4",
         "pinned_by":"Tiemen",
         "author":{  
            "name":"John",
            "avatar":"some-url"
         },
         "message":{  
            "body":"Some message body",
            "time":15000000001,
            "reactions":[  
               {  
                  "identifier":"raised_hands",
                  "count":12
               }
            ]
         }
      }
   ]
}