there have been issues with filenames that include spaces or other
characters. this is solved by double URL encoding.

for details see the migration guide for v2.0.0:
https://github.com/bootstrap-vue/bootstrap-vue/releases/tag/v2.0.0

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