[fix #9] Euen.9.authentication

Is checked in 

```erlang
get_matches(User) ->
  MatchesAsP1 = sumo:find_by(fiar_match, [{player1, fiar_user:get_id(User)}]),
  MatchesAsP2 = sumo:find_by(fiar_match, [{player2, fiar_user:get_id(User)}]),
  MatchesAsP1 ++ MatchesAsP2.
```