Fixed name pattern
Merge pull request #54 from Gruppe01/persistence-updatehandler

Fixed name pattern
Fixed DataHandlers
Client server communication now working.
Merge pull request #55 from Gruppe01/persistence-updatehandler

Fixed client server communication
Merge pull request #56 from Gruppe01/gui-weekcalendar

Gui weekcalendar
Merge branch 'master' of https://github.com/Gruppe01/EXPHIL03 into gui-weekcalendar
Made some changes. Removed duration field as it's really useful.