Pin rack-google-analytics version

Bimble upgraded the Rack Google Analytics version to 1.0, which uses the new `analytics.js` code, and we still have some sites on
odi.org subdomains that use the old code. My guess is because we're using `ga.js` AND `analytics.js` on the same account, GA is on
ly counting those that use `ga.js`.

We should probably also discount any views we get for Google drive too, as those are mainly internal.