Enforce Authentication throughout OpenHarvest (using JWTs)

[Philipsty]

Enforce user login at OpenHarvest.net startup page so that id is mandatory to access the application.

[rayoz12]

I implemented JWT authentication we just need to enforce it now across all the routes and api. We also need to test and implement these changes on the front end. The front end has support for JWTs and stores it in local storage already but it just doesn't send it.