Merge pull request #5 from WOYM/master

aktualisierung
execute() refactored #56
Merge pull request #84 from JurSch/working_with_teacher_cammds

Working with teacher cammands #83
Merge pull request #6 from WOYM/master

Aktualisierung
Experimental Build generic AddCommand #86
#82 bearbeitet.
Merge pull request #87 from JurSch/experimental_add_command

Experimental add command #86
Merge pull request #7 from WOYM/master

Aktualisierung
#88
#89
Merge pull request #93 from alueck/master

#82 durch review gekommen
Merge pull request #90 from JurSch/dletecommand

DeleteCommand hinzugefügt #89
Merge pull request #91 from JurSch/updatecommand

UpdateCommand hinzugefügt #88
Merge pull request #9 from WOYM/master

Update