[openstreetmap-website] Update to rails 4 (#432)

[Tom Hughes]

I've managed to fix the asset issue completely now for iD I think, and there are just a couple of minor assets issues left for Potlatch that I need to sort out.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/432#issuecomment-22780790
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