Also, there is no annoying reload upon logout anymore

The former student data endpoint /export/csv/ has been replaces by /export/json/ .
This new endpoint exports the data as normal json. It also allows the client to send setPasswords: true as an option which will results in random passwords beign generated for all students and included in the export data.

also removed one passible cause for memory leak. Feedback was unnecesarily stored in the store under state.feedback

Solution is no longer displayed on student page because it may contain grading information which has been changed during the grading process and would thus confuse the student

Use postgres:9.6 is ci

This is needed in order to install the forked repo `djangorestframework-camelizer` from github

Nearly completed typing the whole store!

Merge branch 'activate-deactivate-tutors' of gitlab.gwdg.de:j.michal/grady into activate-deactivate-tutors