Fix gauge crash and improve error management.
Merge fix
Merge branch 'master' of github.com:Heigvd/Wegas

# By Francois-Xavier Aeberhard
# Via Francois-Xavier Aeberhard
* 'master' of github.com:Heigvd/Wegas:
  Refactor GameModel properties to embedded object
  Refactor useless Y.namespace("Wegas") -> Y.Wegas