'Creates one instructor and several course staff for self.course. Assigns
them to self.instructor (single user) and self.staff (list of users),
respectively.'

def create_staff_and_instructor(self):

    self.instructor = InstructorFactory(course_key=self.course.id)
    self.staff = [StaffFactory(course_key=self.course.id) for __ in xrange(STAFF_COUNT)]
