logging added into core.py
show error message while adding duplicated groupname
Added config-resolver dependency.
PEP8 indentation.
Alphabetically sorted requirements.
Using config_resolver for instance config.
Added a "register" page.
Simplified serving closure code.
Better closure file-structure.
Basic frontend implementation for registrations.
Minor visual improvments.
Import cleanup.
These methods belong into core. Not model!
Bugfix.
Better route for rgistration confirmation.
Added skeleton functions to the model.
Reporting status to user after confirmation.
Documented the stubs in core. Added "accept reg.".
PEP8 fixes.
Upgraded dependencies to latest versions.