RefStack UI should properly handle user signout.
How to check:
Open two RefStack in two browser tabs and signin in both. Then signout in first
tab. Then try to open 'Profile' or 'My Results' in second tab. If everything is
ok you will be redirected to RefStack home tab.
Change-Id: Ifc14ba953b269ce8940f82e61d7f3634682fe0da
8f8bf6dce3