when the app is mounted we cannot log to the vue logger yet
this throws an error before the signOut method is called

now fixed by using console.log only in debug environments

fixes #5

vue always throws a render error, even if we include a test for user.steeringUser
before comparing user.steeringUser.is_superuser.

so we moved it to the js logic and use a separat modules array for superusers

For vue-devtools see https://github.com/vuejs/vue-devtools

* deactivate superuser entries for standard users
* consistent naming

Merge branch 'feature-showmanager-superuser' of gitlab.servus.at:autoradio/dashboard into feature-showmanager-superuser