Permission remove with it's id.

*Fix #214
Merge branch 'master' of github.com:Heigvd/Wegas

# By Francois-Xavier Aeberhard
# Via Francois-Xavier Aeberhard
* 'master' of github.com:Heigvd/Wegas:
  Fix team creation issue
  Fix #361
  Refactor mcq-tabview filename
  Fix #334
  Fix  join team widget no teams msg
  Fix issue in UserController
  Refactor datasource walk function