Currently students and tutors have access to the /tutor/ endpoint in the browsable api and at least get a 200 response in the tests for the /student/ endpoint however can not access this one in the browsable api.

* no url configuration needed simply register viewset with router
* now using DefaultRouter, meaning api root is now browsable
* merged some views
* makes it easier to include api schema later
* Ran isort and updated docstring

* ran isort on all test files

* also moved test concerning access rights to another test suite