make register hint translatable
Enable logging to stdout for test suite (log level = INFO)
Added log output in case of invalid JSON configuration values
Decrease log level for memcache setup
Use equals instead of like operator in Badge.find
Add option to forbid display_name change
Added config options to map shibboleth attributes to user data

Added options:

- adhocracy.shibboleth.display_name.function
- adhocracy.shibboleth.locale.attribute
- adhocracy.shibboleth.register_form

Switched to JSON:

- adhocracy.shibboleth.userbadge_mapping
refactor shibboleth get_display_name
Shibboleth: Allow to force display_name update on login
Add display name function with random suffix
add option to force disable proxy