##Usage
###Students [GET] all students: /students [GET] current student: /students/{studentId}
[POST] student: example of JSON in body: { "name": "New name", "adress": "New adress", "class": "New class", "id": 9 }
[PUT] student: /students/{studentId}?name={newname}&adress={newadress} (not all parameters required.)
[DELETE] student: /students/{studentId}
###Courses Same as students
###Grades [GET] same as students [POST] same as students [PUT] Update students in current course: /grades/{courseId} and JSON in body example: { "students": [ { "studentId": 4, "grade": 8 }, { "studentId": 1, "grade": 9 } ] } [DELETE] Whole course: /grades/{courseId}
[DELETE] Current student from course: /grades?courseId={courseId}&studentId={studentId}