Fixed employee form submit

Buttons must be inside form and have correct type.
Fixed submit for all other forms
Added favicon
Merge pull request #23 from utwente-di/Form-fix

Form fix fixes #8
activity details with labels
Merge branch 'master' of github.com:utwente-di/di06
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
Slightly better activity details