export participation as pdf, fixes #7300
updating rails to 4.0.6
move j_s_number to wagon, refs #7300
moved more to wagon, filename for pdf, refs #7300
qualification kinds for course leaders (#7307)

 * add category/role field to qualification kind association
 * remove prolongation/precondition associations
 * add select-field for each category/role to event kind form
 * refactor qualifier to be initialized with role
fix rubocop offense
events/courses naming and explanation (#7298)
fix PeopleController regression test
participation pdf: use new qualification kinds assoc., minor fixes (#7300)
event kinds helper: use human attribute name
required answers for questions, fixes #7292
fix qualification_kind (translations) n+1 queries
qualification_kinds, custom fonts, refs #7300
participations: disable subscribe button if already subscribed (#7296)
fix rubocop warning
fix n+1 query on application_market, refs #7304
additional participation count info, fixes #7302
fix rubocop warnings
extract filter from participations_controller
better extension points for pdf participation