Clear localStorage and sessionStorage and redirect to fronPage if call
to FB api's /me/friends returns an error

This happens when a user logs out of FB outside of yo-banfa then tries
to continue using yo-banfa. Their id, token, etc. will still be in
localStorage, but auth with FB won't work.
Merge pull request #77 from jlburkhead/dev

Clear localStorage and sessionStorage and redirect to fronPage if call