Fixes #166 -- Add auto-generated staff list based on badge status flags
Make profile listing a bit more dynamic esp. on smaller screens.
Refers #166 -- Change badge_status into a M2M model relationship

The current implementation doesn't really allow to filter for profiles
with a certain status, e.g. only orga, as the field, indicating the
statuses on the profile, is a comma separated char field.
Merge branch 'feature/staff-list' of github.com:EuroPython/djep into feature/staff-list
Refers #166 -- Rename StaffListPlugin to a more generic name (UserListPlugin)

See https://github.com/EuroPython/djep/pull/171#issuecomment-45585366
Refers #166 -- Support up to two lines for usernames.
Refers #166 -- Translations
Merge pull request #171 from EuroPython/feature/staff-list

Fixes #166 -- Add auto-generated staff list based on badge status flags