Added ManyToMany for Label and Activity
Merge branch 'master' into label-toevoegen
wat
Added dedicated resource for activity labels
Merge branch 'master' into label-toevoegen
Made fetch eager
Added json content type
Removed superfluous transaction
Better DELETE handling
Merge pull request #25 from utwente-di/label-toevoegen

Label toevoegen (Model+REST)

Ooit wel nog kijken naar welke errors we wanneer geven. Zelf ben ik voor 4xx ipv 5xx