[openstreetmap-website] SotM Banners on the Front Page (#268)

Alex Barth notifications at github.com
Sun May 12 21:11:59 UTC 2013

This technique uses Ruby's `[sample](http://ruby-doc.org/core-2.0/Array.html#method-i-sample)` to pick randomly between the Birmingham and San Francisco ads. 50 % of users will see the Birmingham ad, 50 % of users will see the San Francisco ad.

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