implemented auto refresh auth token

- save/delete auth token
- refresh token 1 minute before it is set to expire
- check if stored token is valid on page load
- refactored user service to be cleaner
Merge pull request #13 from nexus-uw/feature/refresh-token

implemented auto refresh auth token
fixed refresh token test
Merge pull request #14 from nexus-uw/bug/fix-refresh-token-test

fixed refresh token test
linked build status to public page
Fixed login styling

  - Removed bootstrap
  - Added styling to login
  - Added working sass compilation rule
Merge pull request #15 from rvaiya/loginfix

Fixed login styling