Setup rest api

This patch adds django-rest-framework to the project.
Main changes:
- added api endpoint to urlpattern, dividing the api routers in project-bound and default.
- added a viewset for the objectstore table. only the create (POST) method is implemented by now. any other method will return a 403 error code
- added a test for the job ingestion endpoint

@camd , @jeads  could you please review it?  It's a tiny patch :)