chrome popup signing fix. closes #44
chrome popup signing fix. closes #44

Decided to leave sign in active in popup.  Required adding back in sign
in and sign out button to popup.html and fixing auth documentation to
note that you must add prod_signin.js in place of signin.js if using
auth.

TeamHG-Memex/Datawake,Sotera/datawake-prefetch,Sotera/Datawake-Legacy,Sotera/Datawake-Legacy,TeamHG-Memex/Datawake,Sotera/datawake-prefetch,Sotera/datawake-prefetch,Sotera/Datawake-Legacy,TeamHG-Memex/Datawake,Sotera/Datawake-Legacy,Sotera/Datawake-Legacy,Sotera/datawake-prefetch