Teacher can login / logout

[utsab]

Currently, the app has not authentication system. When the app loads, the user is already able to view the list of students and add new students. We need to allow individual teachers to login and view the students that are in their specific class.

This ticket will solve only the first step which is to allow login. This ticket does not need to implement the separation of classes.

Discussion: Should we use password login or password-less login (oauth)?

[imcodingideas]

@utsab I'm currently working on a breaking change for you with this #62

I'm fixing tests, and once those are working we should be able to merge it.

[user512]

@imcodingideas Are you also working on this ticket? We can take this if you are not currently working on it.