Make it work with new analytics script

[Fuxy22]

By the looks of the code this doesn't work with the new analytics script does it?

Here's what I'm referring to: https://developers.google.com/analytics/devguides/collection/analyticsjs/

[scottgmeadows]

+1

[jstoeffler]

I've created a fork with this: https://github.com/jstoeffler/phpA-B
I didn't test it thoroughly, but it seems to work.

And here's a PR in case you're interested in merging it into the base project : #9

[iagomls]

+1

[justinputney]

+1