Announcements
An announcement made to users in a cursus on their homepage.

GET /v2/announcements/graph(/on/:field(/by/:interval))
Return grouped temporal data on announcements

GET /v2/announcements/:id
Get an announcement

POST /v2/announcements
Create an announcement

POST /v2/cursus/:cursus_id/announcements
Create an announcement for the given Cursus

PATCH /v2/announcements/:id
Update an announcement

PUT /v2/announcements/:id
Update an announcement

DELETE /v2/announcements/:id
Destroy an announcement