anchor.diff:  When used as a portfolio (for virtual currency), transactions add or remove units too.
   And feel free to invent new uses!
   
  -## POST /v1/gamer/tx
  +## POST /v1/gamer/tx/{domain}
   
   A transaction is a Hash where the key is the unit, and the value is a positive (credit) or negative (debit) amount.
   So a single transaction can both credit and debit different units.
  +
  ++ Parameters
  +    + domain (required, string, `private`) ... The domain used in the transaction
   
   + Request (application/json)
   
  
positive.code:             "<gamer_id>" : "..."
          }
  
  ## GET /v1/gamer/godchidren
  
  Get all the godchildren of the current user.
  
  + Request (application/json)
  
  
negative.code:         { 
              "godchildren" : [ { "gamer_id" : "..."}]
          }
          
  # Group Scores and Leaderboards
  
  ## Scores
  