cannot demote the only admin of a club
Merge commit '15208c9fcc1ade01491206215b96b8779b4dbc87' into topic_club_style

* commit '15208c9fcc1ade01491206215b96b8779b4dbc87':
  cannot demote the only admin of a club

Conflicts:
	BearClubs/bc/templates/manage.html