Fix missing user error

When a user first logs in with a fresh mongo db the user can be missing
when this happens log out and redirect back to the login page
Use ng-cloak to fix fouc problem
Fix sass lint error
Merge pull request #439 from reviewninja/feature/fix-fouc

Use ng-cloak to fix FOUC
use res.sendFile instead of deprecated res.sendfile
Merge remote-tracking branch 'origin/master' into feature/keenio