fix for double-callback issue with google login
fix for double-callback issue with google login

gapi auth result callback is called twice, causing us to try and 
POST to our API twice - which causes a 401 that is shown to the user

this is a quick fix for the problem, could probably troubleshoot our 
usage of gapi to fix the problem there too.

related reading:

http://stackoverflow.com/questions/23020733/google-login-hitting-twice
stormpath/idsite-src,nrgmeeting/idsite-src,stormpath/idsite-src,blackshore/idsite-src,blackshore/idsite-src,nrgmeeting/idsite-src,nrgmeeting/idsite-src