mozilla/butter — pull request #1598 by kylerush (2013-03-18 16:04:46+00:00)
Title: Added GA setDomain method to track users across subdomains.

This change allows us to see aggregate analytics (navigation summaries, etc.) for users that first land on webmaker.org and then navigate to popcorn.webmaker.org.

More info here: https://developers.google.com/analytics/devguides/collection/gajs/gaTrackingSite