[openstreetmap-website] Convert user navigation to a dropdown menu (#447)

[Tom Hughes]

On top of that the `:size => 20` you're passing to `user_image_url` probably doesn't do what you think it does - in fact it does nothing in the non-gravatar case.

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https://github.com/openstreetmap/openstreetmap-website/pull/447#issuecomment-22737928
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