AccountController now updates the user's email address

Still need to separate  setting password / updating password / updating email to different controller actions
Switched back to a panel-based layout instead of the tabs

The tabs looked terrible on mobile
Merge branch 'master' into more-ui-styling
Merge branch 'master' into more-ui-styling
Now using DI to build the IAuthenticationManager.
Merge remote-tracking branch 'origin/more-ui-styling'