[openstreetmap-website] Add an overpass based query tool (#721)

[Tom Hughes]

I've tweaked this a little bit - merged @danstowell's link colour patch and also updated it to use some new overpass features.

I'd like to merge it now, unless anybody can see a good reason not to?

As always, there's a live version at http://overpass2.apis.dev.openstreetmap.org/ that you can play with.

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https://github.com/openstreetmap/openstreetmap-website/pull/721#issuecomment-61781520
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