[openstreetmap-website] add SotM Baltics banner ad to rotator (#286)

[sotm-baltics]

![sotm-baltics-ad](https://f.cloud.github.com/assets/4500891/549297/80670110-c2f6-11e2-8195-ecade685b3fd.png)

You can merge this Pull Request by running:

  git pull https://github.com/sotm-baltics/openstreetmap-website master

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/286

-- Commit Summary --

  * Add SotM Baltics banner ad.

-- File Changes --

    M app/views/layouts/site.html.erb (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/286.patch
https://github.com/openstreetmap/openstreetmap-website/pull/286.diff

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