[openstreetmap-website] fixes for trac #4730 (also #4748) (#216)

[Tom Hughes]

First impression is that this mostly looks like great work, so thanks for doing such a good job.

I'll have a detailed look at this in the next few days, but there are clearly some things here (like the travis config) that have nothing at all to do with fixing that bug and they should be removed from this pull please.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/216#issuecomment-14148336
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