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

[Tom Hughes]

Fixed the 500s from /map and the note creation, and the 404 for markdown previews.

Still trying to work out what's going on with the translations.

Fixed some of the asset issues, but any assets (mostly in iD) but are not being loaded through the assets pipeline are still failing because rails 4 no longer generate copies of assets without the hash in public/assets during the precompile phase. Instead anything which is not supposed to be served via the assets pipeline is supposed to just be placed in the public directory in rails 2 style.

That poses something of a problem for us however...

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