[openstreetmap/openstreetmap-website] Add support for rotating banners, add banners for SOTM, SOTMUS (#1240)

[Bryan Housel]

@pnorman, the flashes seem ok.. They will still appear above the welcome / banner divs:

<img width="1297" alt="screenshot 2016-06-23 01 28 53" src="https://cloud.githubusercontent.com/assets/38784/16292706/f98795be-38e1-11e6-9a0a-40e9bb59c995.png">

<img width="1236" alt="screenshot 2016-06-23 01 31 51" src="https://cloud.githubusercontent.com/assets/38784/16292756/5044734a-38e2-11e6-88f7-ac049aa95f16.png">



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