This endpoint returns the time delta of the JWT Tokens as specified in the settings file #22

This endpoint will return the role of the authenticated user, 'Student', 'Tutor' or 'Reviewer'

The extra functionality offered by the ViewSet is not needed in this place and caused unexpected behavior (it returned an array containing an object, breaking the StudentView). For this very simple View imo explicit is better than implicit.

* IT waS A FUCKIng tyPO
* ran isort and flake8 and fixed reported issues

* 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

* Also added docstrings to classes and module in views.py
* Removed a logging statement from StudentApiView

- changed unittester from ./manage.py test to pytest in CI
- implemented tests for various views see previous commits
- coverage should now produce html output for test coverage

* ran isort on all test files

The methods in core.tests.data_factories.py are not finished nor good and overlap with GradyUserFactory.

Not working!

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

- ran isort to properly sort imports
- reformatter some classes

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