Use login authentication tokens in all API calls

[nbarlowATI]

Goal

Require use of token to make API calls

Acceptance criteria

API no longer accepts requests without valid token.

Out of scope

Log off from front end only.

Implementation notes

• [x] Frontend to re-enable authentication login, store in local storage.
• [x] Middleware to check token before accepting requests.
• [x] Dockerised Flask app to authenticate.

[masonlr]

Aiming to call the gateway-auth /auth/status endpoint for authorisation check. Will aim to implement this using a resource method decorator described in the flask restful documentation: http://flask-restful.readthedocs.io/en/0.3.5/extending.html#resource-method-decorators

[masonlr]

This has been implemented as https://github.com/alan-turing-institute/gateway-auth.

The authentication is activated by alan-turing-institute/gateway-middleware#23.