test delete student om schooladmin work
Have changed the code to use callbacks on addStudent, studentWithId
added deleteStudent with callback and test are green
added coursesproperty on student, and changed tests, all works!
done a lot of changes, have to commit
after some problems the code finally works again
Admin can send messages and student can receive. Hurray!!
load, save, add, and delete to db works
changed listOfStudents, listOfCourses, begun with validation