Update Login test

[adydams]

Action : Created the users_login files
Guide : The users_login. js file is use to run a TDD on the users' login functionality of user.controller.js file with frisby
global setup is kept
Date : 3rd July 2018

[wilforlan]

You should not just expect a status 200, you should expect some properties and assert their types and check if they available to pass this test.

Also, you need to set a global token constant after a successful login