anchor.diff:                  "id": "123",
                   "username": "heshammassoud",
                   "email": "heshamhamdymassoud@gmail.com",
  -                "password": "LimpBizkit22!",
  -                "confirmationPassword": "LimpBizkit22!"
  +                "password": "myPassword!",
  +                "confirmationPassword": "myPassword!"
               }
   
   ## Authentication [/users/{id}/login]
  
positive.code:     
              {
                  "e-mail": "heshamhamdymassoud@gmail.com",
                  "password": "LimpBizkit22",
              }
  
  ## Preferences [/users/{id}/preferences]
  
negative.code:         {
              "username": "heshammassoud",
              "email": "heshamhamdymassoud@gmail.com",
              "password": "myPassword!",
              "confirmationPassword": "myPassword!"
          }
  
  + Response 201 (application/json)
  