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

[John Firebaugh]

@tomhughes Have you taken a look at my proposal on the routing PR for having a click on the map bring up a search sidebar?

![image](https://f.cloud.github.com/assets/98601/2463371/5cf3eba8-af8b-11e3-9f8a-ee19b6555248.png)

My thought was we could avoid having a separate button and mode for this, and just have this sidebar ^ include overpass results too.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/721#issuecomment-38939942
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