switch to using plain old gapi client (via auth.js)
use client.js because we actually need gapi.client.request().
Use immediate: false for the time being, to force a pop-up.
Add a parameter specifying whether we want a login popup
On page load, check whether the user is logged in.
Merge pull request #181 from googlemaps/gapi-auth-authorize

Don't request to "know who you are on Google"