Also, the student is not greeted with the anonimised name anymore

fixes #131

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

The student page will no longer crash should there be no feedback objects for submissions and display a message to the user explaining that the submission hasn't been corrected due to the exam beeing pass only.

Routing is ow dynmacilly handled by selector components. E.g. the LayoutSelector will render as the correct Layout depending on the logged in users role. This allows to simply route to e.g. '/home/ and the StartPageSelector will determine if StudentPage or TutorStartPage should be displayed.

Restructured front end code into components and pages
Components should be as dumb and generic as possible. Pages should dispatch actions, pass props to components etc,
Student page now gets submission and submissiontyp from api and displays those to the student
Added information which submissions have been viewed

Implemented version of the student-page using vuetify and the new general layout. The side navigation should be displaying links to the (not yet implemented) detail views of the submissions to provide easy way to change between submission views.

Added BaseLayout component that will serve as bas for the layout of the app. It is modeled after https://next.vuetifyjs.com/examples/layouts/google-contacts . The gradySpeak has been moved to the front-end.

Backend
- Added isStudent permission
- Added serializers apropriate for StudentPage
- Added api-endpoint urls
- Added views regarding StudentPage
- Migrated the Django Session Authentication to djangorestframework-jwt authentication

Frontend
- Migrated from vue-resource to axios because of better documentation & features
- Added Login Component
- Added First Part of StudentPage containing overview of exam and subissions

Closes #41
References #39

Backend
- Added isStudent permission
- Added serializers apropriate for StudentPage
- Added api-endpoint urls
- Added views regarding StudentPage
- Migrated the Django Session Authentication to djangorestframework-jwt authentication

Frontend
- Migrated from vue-resource to axios because of better documentation & features
- Added Login Component
- Added First Part of StudentPage containing overview of exam and subissions

Closes #41
References #39