removed lecturer flag
changed menu structure for lecturers
south migration (remove is_lecturer from db)
added responsible person to courses
added can_edit for assignments; renamed lecturer to contributor in UI; changed lecturer's edit options in course view
updated language file
merged with develop
correct some merge fails in the .po file
courses must now have exactly one responsible person; removed delegate flag in user list
rename logon to login
fixing ui problem with responsible person's name when formset is in error state
send publishing notification to all contributors and participants
auto-select "can_edit" for responsible persons
minor language file updates
rename lecturer to contributor
told travis about renaming
rename assignment to contribution
Merge branch 'rem_lflag' of https://github.com/janno42/EvaP into rem_lflag
removed contributor checks in code and added tests
trying to fix test_import